Abstract: Connector/coupling for connection of conduit has hollow housing, collar with internally-directed protrusion capable of engaging the conduit, and means for fastening the collar to the housing to hold these together. A quick-disconnect coupling includes receiving piece with hollow passageway, passage portion and receiving end; on the outside about the receiving end is generally cylindrical surface with a groove of a width and depth capable of receiving a stopping object, and a part of the object resides above the outside surface; a swivel collar has a generally cylindrical receiving piece mating surface with a groove therein of a width and depth capable of receiving at least a portion of the part of the stopping object which resides above the outside surface; a connect device holds a received piece to the receiving piece; and a stopping device is a part thereof. Inside-out cutting saw may be employed to cut the conduit, for example, PVC helical hose.

Abstract: A male member to a hose adapter as for metal to metal, male to female, mating has a frustoconical sealing surface, for example, of 30, 37 or 45 degrees, for mating with a corresponding female member having a corresponding sealing surface. These surfaces are secured by a rotating female member, threads of which mate with the corresponding, threaded male member. The mating parts are drawn together as the threads are engaged and fully torqued. The male frustoconical surface is interrupted by a machined recess or undercut area, for example, of about 0.20 to 0.40 inches deep. This recess or undercut typically starts about one third of the way up the male frustoconical surface, and continues until the taper incline intersects with the threaded plane parallel to the bore of the adapter, and a recess or undercut extension can continue along the thread plane parallel or slightly tapered with respect to the bore until it reaches the base of the male thread, where it terminates.

Abstract: A universal-type coupling member including a head portion, a stem portion rotatable in the head portion, and a gasket inset in the head portion and in sealable contact with the stem portion, and having a fluid passageway therethrough is provided, which can be connected to another appropriate universal-type coupling member. Use of the coupling member of this invention can relieve the uncoupling effects of twist or torque in universal-type coupling combinations.