Abstract: A connector system for releasably securing a reservoir to a spray gun includes hook members on a lid of the reservoir that engage a flange of an inlet adaptor on the spray gun with a push/twist action to secure the reservoir to the spray gun. A retainer clip mounted on the inlet adaptor is movable between an inoperative position to allow the reservoir to be connected to and disconnected from the spray gun, and an operative position in which the clip blocks release of the reservoir. The clip provides security against accidental release of the reservoir in use of the spray gun.

Abstract: An antistatic reusable cup holder and fluid supply assembly. One or more of the reusable cup holder, disposable cup, disposable lid, or reusable outer lid is made of an antistatic material. In use, the chargeable particles in a coating mixture do not stick to the disposable cup so that uniformity of the coating mixture is maintained while it is dispensed. A method of maintaining the uniformity of a coating mixture during dispensing is also described.

Abstract: A conversion adapter for connecting a fluid supply assembly to a fluid applicator. The conversion adapter provides a connection between the fluid supply assembly and the fluid applicator. The conversion adapter has a first end and a second end, and a bore between the first end and the second end. The first end has a complementary connecting surface mating with the connecting surface on the fluid supply assembly. The second end has a complementary connector in the bore, and a top and bottom. The complementary connector is selected from complementary grooves or complementary projections, and mates with the connector on the adapter of the fluid applicator.

Abstract: A flexible, disposable cup for use in a fluid supply assembly. The disposable cup is made of an antistatic material whereby chargeable particles in a coating mixture do not stick to the disposable cup so that uniformity of the coating mixture is maintained while it is dispensed. A method of maintaining the uniformity of a coating mixture during dispensing is also described.

Abstract: A flexible, disposable cup for use in a fluid supply assembly. The disposable cup is made of an antistatic material whereby chargeable particles in a coating mixture do not stick to the disposable cup so that uniformity of the coating mixture is maintained while it is dispensed. A method of maintaining the uniformity of a coating mixture during dispensing is also described.

Abstract: The present invention relates generally to a gas-compression spray device, wherein the nozzle assembly containing all of the wettable parts is detachable from the body of the spray device.

Abstract: A hand-held apparatus for spraying texture material including a body, a pressurized air source mounted on the body, a texture material hopper mounted on the body, and a texture delivery nozzle for selectively spraying texture material from the hopper onto a surface to be coated by propelling the texture material using pressurized air from the pressurized air source wherein each of the air source and the hopper can be disconnected from the body without the use of tools.

Abstract: A spray gun and a detachable liquid reservoir releasably attached to the spray gun by engagement of mateable, non-threaded formations provided on the spray gun and the reservoir. The spray gun has an integral connector boss with a socket for reception of a connector tube of the reservoir. The boss has an external flange at the distal end and the reservoir has hook members separate from the connector tube. The hook members are co-operable with the flange when the connector tube is received in the socket to secure releasably the reservoir to the spray gun. In another arrangement, the connector tube is an interference friction-fit in the socket to secure releasably the reservoir to the spray gun. In yet another arrangement, the connector tube has bayonet lugs co-operable with bayonet grooves in the wall of the socket when the connector tube is received in the socket to secure releasably the reservoir to the spray gun.

Abstract: Systems and methods for dispensing an anti-traction, mobility denial material on a target surface. In various exemplary embodiments, a method of dispensing an anti-traction material on a target surface includes providing a polymer particle powder to a first section of a dispensing nozzle, providing a water stream to a second section of a dispensing nozzle, and mixing the polymer particle powder with the water stream upon exit of the streams out of the first and second sections of the dispensing nozzle to form the anti-traction material on the target surface, the formed anti-traction material being a gel.

Abstract: A flexible, disposable liner for use in a fluid supply assembly. The disposable liner is made of an antistatic material. In use, the chargeable particles in a coating mixture do not stick to the disposable liner so that uniformity of the coating mixture is maintained while it is dispensed. A method of maintaining the uniformity of a coating mixture during dispensing is also described.

Abstract: A cleaning and releasing device has a hand valve provided on a flow passage of a pressurized liquid in the vicinity of an injection nozzle, a switching valve 5 provided in a proper position on the flow passage of a pressurized gas, flow detecting means provided in a proper position on the flow passage of the pressurized liquid, and a controller for controlling the switching operation of the switching valve based on a result of detection transmitted from the flow detecting means, and controls the switching valve to supply and stop the pressurized gas depending on the presence of a flow of the liquid generated by the switching operation of the hand valve. The supply and stop of a powder and granular material may be controlled based on the result of detection transmitted from the flow detecting means.

Abstract: An adapter assembly for connecting a fluid supply assembly to a fluid applicator. The adapter provides a connection between the fluid supply assembly and the fluid applicator that can be engaged quickly, easily, and securely, and which has a strong tight seal around the connection.

Abstract: The invention relates to a gravity cup for a paint spray gun. The gravity cup includes a reservoir (1) and a lid (2) that is placed thereon and that has a connecting part (3) so that the gravity cup can be placed on the paint spray gun or an adapter. The reservoir (1) is provided, in a wall (4) thereof, with a ventilation hole (6) that can be obturated by means of a valve (5). The aim of the invention is to provide a gravity cup that comprises a valve that can be easily actuated by hand so as to obturate the ventilation hole. For this purpose, the valve (5) is configured as a sliding valve comprising a valve housing (7) and a slide (8) that can be displaced in relation to the valve housing (7) in a direction of displacement (V) extending parallel to the wall (4).

Abstract: Disposable cup for preparing, applying and preserving a paint to be set up on a paint spray gun characterized in that it includes on one of its end faces a closable vent device (7) forming a vent valve with valve duct (22) and valve plug (25) which allows when opened, to let the air pass for occupying the inner volume that empties and when closed, to close liquid-tightly the opening (6) of air passage to form a container for the preparation of the paint and then to form a pot for the preservation of the leftover paint. This invention is of interest to manufacturers of paint spray guns.

Abstract: The invention relates to a fluid reservoir for a paint spray gun, comprising a cup-shaped receptacle (1), a lid (2) that can be placed thereon (1) and a connecting part (3) which can be formed on the receptacle (1) or on the cover (2) and which is used to secure the fluid reservoir to the paint spray gun. According to the invention, a transition area (12) between the connecting part (3) and the receptacle (1) or the cover is embodied in a flexible manner in order to adjust the inclination of the receptacle (1) or the cover (2) in relation to the central axis (14) of the connecting part (3) in order to improve material guiding, even when the paint spray gun is inclined positions.

Abstract: To make a change of paint colors during painting work easy and thus quick to perform on a spray gun, the invention proposes a spray gun container having a paint holding area, which is accessible essentially through two main openings, and having at least one additional access to the paint holding area, in which the additional access is reclosable by means of a closure means, whereby said closure means is at least partially arranged in the additional access during the closing of the additional access.

Abstract: A connector part (3) for connecting a material supply device (10) to a spray gun (20) that includes a hollow cylindrical connection piece (5); a threaded wedge element (8) with a lower starting point (8a) and an upper end (8b) running around the outer circumference of connection piece (5) and serving to produce a threaded wedge connection to a counter-element (15) arranged on gun base (19) of spray gun (20); and a stop element (14) that forms a limit stop during the production of the threaded wedge connection. In order to prevent the counter-element on the spray gun from digging into the soft connection pipe made of plastic and removing plastic chips there, it is provided in the connector part according to the invention that stop element (14) is arranged at a distance in the circumferential direction from upper end (8b) of threaded wedge element (8), whereby a gap (11) is formed between stop element (14) and upper end (8b) of the threaded wedge element.

Abstract: A spray gun 101 has a spray head 150 connected to a body 102 of the spray gun 101 and a reservoir 156 connected to the spray head 150 for supplying liquid to a spray nozzle 153 of the spray head 150. The spray head 150 is arranged so that liquid from the reservoir 156 is delivered to the spray nozzle 153 without passing through the spray gun body 102 in response to actuation of the spray gun 101 via a trigger 105. The spray head 150 is releasably secured and can be detached from the spray gun body 102 and thrown away after use. The reservoir 156 is mounted on the spray head 150 and can be removed and thrown away with the spray head 150 after use.

Abstract: A spray paint gun having a disposable cartridge inserted therein such that paint can flow through the cartridge in the spray gun without touching the spray gun. Since no part of the spray gun has paint touching it, there is no cleaning of the spray gun or its components. The cartridges can be easily inserted into the spray gun and easily removed such that different color paints can be used in the spray gun in quick succession without down time for cleaning. There is no use of solvents for cleaning, making the cartridge spray gun environmentally friendly. The disposable cartridges eliminate expensive time consuming cleaning. The cartridges can be breach loaded into the front portion of a spray gun and front portion containing the cartridge can quickly snapped into place and ready for use by a hinged connection to the rear portion or by other connection means.

Abstract: A sprayer includes a spraying body, a paint cup and an adaptor that interconnects the spraying body and the paint cup for fluid communication between the spraying body and the paint cup. The spraying body includes a hand grip, a nozzle, and a connecting region communicating with the nozzle. The adaptor includes a connecting member, a positioning device and a cap mounted to an end of the connecting region. The cap includes a slot defined thereof for receiving the connecting member. The connecting member is pivotable within the slot and can be fixed at a specific angle by the positioning device. The cap also includes a bore defined thereof for receiving the positioning device. The paint cup is adapted to mount on the connecting member. The paint cup can change its orientation through the adjustable adaptor.

Abstract: An apparatus is used in combination with a paint delivery hopper. The hopper includes a body and a connecting portion, with the connecting portion having a connecting end and a projection extending from the body thereof. The apparatus is used to engage with the hopper and it includes a receiving region, a through hole defined in the receiving region for allowing the connecting end to be attached thereto and an engaging hole which allows the projection to be inserted therethrough.

Abstract: A system, in one embodiment, is provided with a fluid container configured to mount on a spray device, and a color additive applicator coupled to the fluid container. A system, in another embodiment, is provided with a color matching support configured to receive a plurality of different color sources, wherein the color matching support is configured to enable the plurality of different color sources to provide different colored additives to a fluid mixing chamber of a spray device. A system, in a further embodiment, is provided with a color additive applicator configured to couple to a fluid container disposed on a spray coating device.

Abstract: A spray paint gun structure having a coaxial control of fluid and atomization includes an atomization control air passage connected to a pressurized air passage in the rear section of a housing. An atomization control adjustment valve includes a sleeve, an atomization adjustment nut, a locking nut, and an elastic member. A rod extending from a fluid control adjustment valve penetrates through the sleeve. The middle section of the sleeve is provided with an external thread to engage with the atomization adjustment nut and the locking nut. The elastic member is accommodated in the rear section of the sleeve. The rear section of the sleeve is provided with an internal thread to relatively engage with a fluid adjustment nut. The atomization adjustment nut is provided with an external thread to engage with a thread relatively disposed at the rear section of the housing.

Abstract: A retrofittable pressure gauge for a spray gun includes a pressure sensor, located in a pressure chamber, a power source and a display unit, all enclosed within a case, a passageway providing fluid communication between the pressure chamber and a pressurised interior space of the spray gun when the gauge is mounted on the spray gun and a mounting fixture configured for mounting the pressure gauge at a spreader valve or a trigger operated fluid valve of the spray gun.

Abstract: A spray gun (1) has a fluid reservoir (11) with a removable liner (13) received in a container (12) having a detachable lid (15). The liner (13), which may be thermo/vacuum-formed from a planar material, has a shape that corresponds to and is a close fit within the interior of the container (12) and collapses as fluid is withdrawn from within the liner (13) during operation of the spray gun (1). The lid (15) has an outlet (16) connected to an inlet on the spray gun (1) for transfer of liquid from the reservoir (11) to the spray gun (1) and the container (12) has a vent (12A) in the base end for admitting air between the container (12) and the liner (13) as liquid is withdrawn from within the liner (13).

Abstract: An adapter assembly for connecting a fluid supply assembly to a fluid applicator. The adapter assembly includes an outer lid for the fluid supply assembly and an adapter. The adapter assembly provides a connection between the fluid supply assembly and the fluid applicator that can be engaged quickly, easily, and securely, and which has a strong tight seal around the connection.

Abstract: A disposable cartridge assembly for use with a paint spray gun is disclosed, being made out of an inexpensive material such as plastic, wherein the paint flows into the cartridge assembly and is sucked out of the tip of the cartridge assembly by the force of pressurized air flowing around the cartridge assembly and past the cartridge assembly fluid spray tip opening, thereby atomizing the paint allowing for an even application of the paint onto a working surface, such as an automobile body. The inexpensive material allows the cartridge to be disposed of after use, rather than cleaned. Further, keeping the paint within the cartridge assembly, and away from any inner workings of the paint spray gun, reduces or eliminates the need to clean the spray gun after use.

Abstract: Modular spray gun apparatus and methods are disclosed. In one embodiment, an apparatus includes a handle module and a head module that is removeably coupled to the handle module. The head module includes a first housing having an inlet adapted to be coupled to a source of pressurized gas, a flow passage extending between the inlet and an outlet, and a first coupling member proximate the outlet. Similarly, the head module includes a second housing having a second coupling member removeably coupled to the first coupling member of the first housing, a nozzle fluidly communicating with a spray outlet, and a needle assembly operatively associated with the nozzle to control a flow of liquid material and pressurized gas emanating from a mixing passage through the nozzle.

Abstract: A retrofittable pressure gauge for a spray gun includes a pressure sensor, located in a pressure chamber, a power source and a display unit, all enclosed within a case, a passageway providing fluid communication between the pressure chamber and a pressurised interior space of the spray gun when the gauge is mounted on the spray gun and a mounting fixture configured for mounting the pressure gauge at a spreader valve or a trigger operated fluid valve of the spray gun.

Abstract: An air brush having a simple structure which can be easily disassembled and assembled without use of any particular tool, for improvement in maintenance performance. In the air brush, a needle to open/close a nozzle member is inserted through an air brush main body. Compressed air supplied from an air valve is blown out of the nozzle member. The compressed air is introduced to the nozzle member and sprayed, with supplied paint, by operation of a finger hooking mechanism. The air brush main body and a tail case are connected via a screw connection member, and a needle chuck is fit-inserted and supported unrotatably but withdrawably. A spring case is fitted around an outer periphery of the needle chuck and screw-engaged in a rear opening of the screw connection member, and a coil spring is elastically set in the spring case. A needle stopper screw is screw-engaged with the needle chuck projected rearward from the spring case.

Abstract: A connector system for releasably securing a reservoir to a spray gun includes hook members on a lid of the reservoir that engage a flange of an inlet adaptor on the spray gun with a push/twist action to secure the reservoir to the spray gun. A retainer clip mounted on the inlet adaptor is movable between an inoperative position to allow the reservoir to be connected to and disconnected from the spray gun, and an operative position in which the clip blocks release of the reservoir. The clip provides security against accidental release of the reservoir in use of the spray gun.

Abstract: An adapter assembly for connecting a fluid supply assembly to a fluid applicator. The adapter assembly includes an outer lid for the fluid supply assembly and an adapter. The adapter assembly provides a connection between the fluid supply assembly and the fluid applicator that can be engaged quickly, easily, and securely, and which has a strong tight seal around the connection.

Abstract: A spraying device is provided that includes a cartridge containing a first fluid, the cartridge being removably connected to a sprayer body. The cartridge is oriented such that gravity exerts a downward force on the first fluid. The sprayer body includes a conduit for receiving a second fluid. A valve is coupled to the conduit. The valve allows the second fluid to flow through the valve, thus creating a Venturi vacuum that draws the first fluid out of the cartridge and into the valve to enable the first and second fluids to mix and form an outlet stream. An orifice meters a predetermined amount of the first fluid into the valve to achieve a predetermined ratio of the first fluid to the second fluid. The outlet stream is then dispensed from a spray nozzle.

Abstract: A single use, disposable reservoir of low volume for use in conjunction with a spray gun for spray painting small areas, for example ‘spray out’ cards for color matching a paint mix for spray painting a vehicle. The reservoir is in the form of a syringe body with a plunger having a sealing member slidable within the body for drawing paint into the body via an open end. The body has an aperture adjacent to a closed end and the plunger can be moved to position the sealing member between the aperture and closed end for releasing a partial vacuum created when the paint is drawn into the body and allow the paint to be withdrawn, in use, when the reservoir is connected to a spray gun without actuating the plunger. In other embodiments, the reservoir comprises a concertina-type body or a pipette body.

Abstract: An assembly for feeding liquid to the inlet port of a gravity feed sprayer. The assembly includes (1) a mixing cup of a known type commonly used to mix paint with solvent that is of stiff polymeric material and bears indicia on its side wall indicating the levels to which a plurality of different liquids should be sequentially poured into the cup to achieve a predetermined ratio between the liquids; (2) a first adapter comprising a central portion having a through opening and a transverse portion including a peripheral part defining a groove along its inner surface adapted for sealing engagement with a top end of the mixing cup; and (3) a second adapter having a through opening, a first end portion of which second adapter is adapted to releasably engage the inlet port of a gravity feed paint sprayer.

Abstract: A connector system for releasably securing a reservoir to a spray gun includes hook members on a lid of the reservoir that engage a flange of an inlet adaptor on the spray gun with a push/twist action to secure the reservoir to the spray gun. A retainer clip mounted on the inlet adaptor is movable between an inoperative position to allow the reservoir to be connected to and disconnected from the spray gun, and an operative position in which the clip blocks release of the reservoir. The clip provides security against accidental release of the reservoir in use of the spray gun.

Abstract: An airbrush including a nozzle has a first connecting section and a polished second connecting section. A projecting stopper section is disposed between the first and second connecting sections. The second connecting section of the nozzle is inserted in a color outlet of a head section of the nozzle. A ventilating plate is fitted on the first connecting section. The ventilating plate is formed with at least one ventilating section for the air to flow through. A shoulder section is formed in the nozzle cap for pressing the ventilating plate against the stopper section of the nozzle. Accordingly, the second connecting section of the nozzle is fixedly fitted in the color outlet of the head section of the brush body. Therefore, the nozzle is fixedly assembled with the brush body by means of the nozzle cap and the ventilating plate, whereby the nozzle can be quickly and conveniently disassemble/assemble without using any tool.

Abstract: A paint sprayer includes a threaded hole defined in a barrel thereof and a connection member is threadedly engaged with the threaded hole. A passage defined through the connection member and shares a common axis with the threaded hole in the sprayer. An eccentric hole is defined in a top of the connection member and an annular groove is defined in an inner periphery of the eccentric hole. An inner diameter of the annular groove is larger than an inner diameter of the eccentric hole. An insertion piece has a first end fixed to a cup and a flange eccentrically extends outward from an outer periphery of the insertion piece. A second end of the insertion piece is rotatably inserted in the connection member via the eccentric hole and the flange is rotatably engaged with the annular groove. The cup can be quickly disengaged from or connected to the sprayer by rotating the cup less than one revolution.

Abstract: A system that is used for control of various liquids, including storage, mixing and dispersing thereof, but more particularly pertains to an improved system that is suitable for use with substantially any type of liquid of user choice. The system is economical, simplified, environmentally friendly, and includes use of multipurpose container(s) that further include various components and/or attachments which allow for storage, mixing and dispensing there from.

Abstract: The present invention provides a liquid spray gun with several improved features, including (1) an air cap portion of a body assembly mounted for manual rotation on a nozzle portion of the body assembly between positions defined by stops and retained at those positions by friction; (2) non-cylindrical air passageways on air horns included in the air cap portion of the body assembly that provide improved shape and uniformity for the wide elongate stream of liquid formed by the spray gun; and (3) the body assembly through which passes liquid sprayed by the spray gun being molded of polymeric material and being manually releasable from a metal platform portion of the spray gun through which air is fed to passageways through the body assembly to spray the liquid.

Abstract: An assembly for feeding liquid to the inlet port of a liquid spraying device or spray gun. The assembly includes a stiff container that defines an opening into a cavity in the container, and a flexible liner positioned within the cavity in the container has an outer surface generally corresponding in shape to the inner surface of the container, an inner surface defining a cavity in the liner, and an annular lip along the top end of the side wall defining an opening into the cavity in the liner. An included adapter assembly has a central portion with a through opening that is adapted to engage the inlet port of a liquid spraying device, a transverse portion including a peripheral part adapted for engagement within the flexible liner adjacent said top end of the container, and means for sealing the flexible liner around the peripheral part of the adapter assembly. An air supply assembly connected to the container supplies air at a relatively low pressure (e.g., in the range of about 0.

Abstract: A paint reservoir has an outlet connectable to a spray gun for transferring paint from the reservoir to the spray gun in use. The outlet is provided with a valve device for opening and closing the outlet to control flow of paint from the reservoir. The valve device has an outer sleeve axially slidable on a spout between a retracted position in which the outlet is closed and an extended position in which the outlet is open. The spout is integral with a lid of the reservoir and the sleeve is a push fit in an adapter for attaching the reservoir to a spray gun. The sleeve is provided with support arms for retainer hooks engageable with the adapter to releasably secure the reservoir to the spray gun.

Abstract: The present invention is directed to a device for releasing a fluid. The device includes a housing having an interior region, a fluid contained within the interior region, and the ability to controllably release the fluid from the housing.

Abstract: Apparatus and methods for swivel attachment of supply vessels to applicator devices are disclosed. In one embodiment, an apparatus includes an applicator device, a supply vessel having an interior volume, and a swivel assembly coupled between the supply vessel and the applicator device. The swivel assembly includes a first engagement member having a protruding portion and a first passageway disposed therethrough, and a second engagement member having a concavity and a second passageway disposed therethrough, the protruding portion being moveably engaged within the concavity such that the interior volume of the supply vessel fluidly communicates with the applicator device through the first and second passageways.

Abstract: A spray gun has a fluid reservoir that contains a removable liner. The liner, which may be thermo/vacuum-formed from a plastics material, is a close fit within the interior of the reservoir and collapses as fluid is withdrawn from within the liner during operation of the gun. Preferably, the liner has a comparatively-rigid base and is capable of standing, unsupported, outside the reservoir. The side walls of the liner are preferably thin in comparison to the base and can be collapsed for disposal of the liner. The reservoir has a removable lid and is capable of standing, inverted, on its own so that it can be filled with fluid. The lid also functions to secure the liner in the reservoir and, at the end of a spraying operation, the lid and the liner are removed together from the reservoir and discarded, thereby simplifying the cleaning of the spray gun.

Abstract: A material supply assembly for use with a spraying device, which material supply assembly includes a housing of stiff material comprising a side wall having a top end defining an opening into a recess defined by the housing; and a pre-filled container comprising a stiff annular lip adapted to be positioned along the top end of the side wall, and a flexible portion fixed to the annular lip and adapted to extend into the cavity in the housing when the annular lip is positioned along the top end of the side wall. The flexible portion has an inner surface defining a cavity, and a quantity of material is within the cavity in the flexible portion. A polymeric membrane extends across and is sealed to the annular lip to retain the material in the cavity.

Abstract: A paint reservoir has a fluid outlet (115) connectable to a spray gun (101) and a fluid inlet (131) provided with a removable screw cap (132) whereby the fluid inlet (131) is directly accessible for introducing paint to the reservoir while attached to the spray gun (101). The fluid outlet (115) and fluid inlet (131) may both be provided in an end wall of the reservoir with outlet (115) located on the longitudinal axis of the reservoir or offset to allow the size of the fluid inlet (131) to be increased for easier filling of the reservoir. The outlet (115) can be aligned with the longitudinal axis of the reservoir or it can be inclined relative to the longitudinal axis to provide greater clearance for access to the fluid inlet (131) when the reservoir is attached to the spray gun (101).

Abstract: In contrast to the conventional air brush, an air brush in the invention has a function in which even a beginner can easily perform an operation for pulling an operating rod little by little while the operating rod is slightly pushed and pulled at an initial stage of the drawing of a line requiring a technique and an experience. The operating rod arranged in an air brush main body forms a slanting face therein projected on the front face of this operating rod while the slanting face is inclined from below to above, and this slanting face abuts on the front side edge of a notch port of the air brush main body. An air valve is opened every small amount and a needle is simultaneously retreated every small amount in a range in which the slanting face of the operating rod and the front side edge of the notch port come in contact with each other and are slid at the initial stage of an operation for pushing and moving the operating rod.

Abstract: A compressed air sprayer used for applying textured material to surfaces, in which the reservoir of texture material is transported on the operator's body using an integrated harness system. The sprayer tank may rest upright on the ground when not being worn, and may be filled in this orientation without damaging delivery components attached to the bottom of the tank. A handle is provided on the tank for proper positioning and transport.

Abstract: An adjustable adapter includes two arms, each having an axis, a surface substantially normal to the axis, wherein the surfaces of the arms face each other, an end and a passageway for fluid communication between the end and the opening, wherein one of the arm ends is for connection to an inlet of an applicator and the other arm end is for connection to an outlet of a container, and a fastener for pivotally coupling the arms. One of the arm surfaces is provided with a groove in fluid communication with both arm openings. The groove is sealed to prevent fluid from leaking from between the surfaces. When the fastener is in a rotation-resisting mode, the fastener forces the surfaces of the arm toward one another sufficiently to increase friction and resist rotation therebetween, and when the fastener is in a rotation-permitting mode, the fastener releases the surfaces sufficiently to decrease friction and permit rotation therebetween.