Abstract: In a preferred embodiment, there is provided an electrically conductive solvent cement for coupling thermoplastic components, the cement comprising a thermoplastic resin, a solvent for dissolving the thermoplastic resin, and an electrically conductive material.

Abstract: A pipe fitting having a first body and a second body that together at least partially define a fluid flow passage. The first body defines a first portion of the fluid flow passage that extends from a first end of the fluid flow passage to a first internal opening. The second body defines a second portion of the fluid flow passage that extends from a second internal opening to a second end of the fluid flow passage. The first body has a first interface surface that surrounds the first internal opening, the first interface surface having a plurality of anti-rotation grooves. The second body has a second interface surface that surrounds the second internal opening and engages with the first interface surface. The first internal opening is in fluid communication with the second internal opening. The second interface surface has a plurality of anti-rotation fingers that are each received by and engage with a corresponding one of the anti-rotation grooves.

Abstract: In a preferred embodiment, there is provided an electrically conductive solvent cement for coupling thermoplastic components, the cement comprising a thermoplastic resin, a solvent for dissolving the thermoplastic resin, and an electrically conductive material.

Abstract: In a preferred embodiment, there is provided an electrically conductive solvent cement for coupling thermoplastic components, the cement comprising a thermoplastic resin, a solvent for dissolving the thermoplastic resin, and an electrically conductive material.

Abstract: A pipe fitting having a first body and a second body that together at least partially define a fluid flow passage. The first body defines a first portion of the fluid flow passage that extends from a first end of the fluid flow passage to a first internal opening. The second body defines a second portion of the fluid flow passage that extends from a second internal opening to a second end of the fluid flow passage. The first body has a first interface surface that surrounds the first internal opening, the first interface surface having a plurality of anti-rotation grooves. The second body has a second interface surface that surrounds the second internal opening and engages with the first interface surface. The first internal opening is in fluid communication with the second internal opening. The second interface surface has a plurality of anti-rotation fingers that are each received by and engage with a corresponding one of the anti-rotation grooves.

Abstract: A pipe fitting having a first body and a second body that together at least partially define a fluid flow passage. The first body defines a first portion of the fluid flow passage that extends from a first end of the fluid flow passage to a first internal opening. The second body defines a second portion of the fluid flow passage that extends from a second internal opening to a second end of the fluid flow passage. The first body has a first interface surface that surrounds the first internal opening, the first interface surface having a plurality of anti-rotation grooves. The second body has a second interface surface that surrounds the second internal opening and engages with the first interface surface. The first internal opening is in fluid communication with the second internal opening. The second interface surface has a plurality of anti-rotation fingers that are each received by and engage with a corresponding one of the anti-rotation grooves.

Abstract: A pipe fitting having a first body and a second body that together at least partially define a fluid flow passage. The first body defines a first portion of the fluid flow passage that extends from a first end of the fluid flow passage to a first internal opening. The second body defines a second portion of the fluid flow passage that extends from a second internal opening to a second end of the fluid flow passage. The first body has a first interface surface that surrounds the first internal opening, the first interface surface having a plurality of anti-rotation grooves. The second body has a second interface surface that surrounds the second internal opening and engages with the first interface surface. The first internal opening is in fluid communication with the second internal opening. The second interface surface has a plurality of anti-rotation fingers that are each received by and engage with a corresponding one of the anti-rotation grooves.

Abstract: A connection to releasably connect and disconnect to a pipe to a fitting provides a pipe fitting body for receiving a pipe and a retaining ring assembly located within the fitting body for retaining and releasing the pipe. The retaining ring assembly has axially extending inwardly angled resilient retaining tabs, each of which has a pipe retaining portion. When the pipe is inserted into the fitting body to an inserted position, the pipe retaining portions engage an indentation on the pipe to retain the pipe in the inserted position. Relative movement of the axially extending inwardly angled resilient retaining tabs with respect to the fitting body from the first locked position to a second unlocked position causes each axially extending inwardly angled resilient retaining tabs to disengage from the indentation on the pipe permitting removal of the pipe from the inserted position in the fitting body.

Abstract: A connection to releasably connect and disconnect to a pipe to a fitting provides a pipe fitting body for receiving a pipe and a retaining ring located within the fitting body for retaining and releasing the pipe. The retaining ring has axially extending resilient retaining tabs, each of which has a radially inwardly extending portion for engaging the pipe, and, a radially outwardly extending portion which extends through corresponding radial openings in the fitting body. When the pipe is inserted into the fitting body to an inserted position and the retaining ring is in the first locked axial position, the radially inwardly extending portions engage and retain the pipe in the inserted position.

Abstract: A frame extending from a first end to a second with a curved portion therebetween has a first dual hooking member at the first end and a second dual hooking member at the second end. Each dual hooking member has a strap hook, facing away from their respective ends, and an external hook, facing toward their respective ends. The strap hooks engage selected holes in a resilient elastomeric strap to bias the first end to the second end across a gap therebetween to frictionally hold the frame to a user's forehead. While the frame is frictionally held to the user's forehead, the external hooks extend externally from the strap to engage opposed strings of a face mask on the users face, and, a visor can be releasably secured to the frame in a visor functional position with a see-through area in front of the user's eyes.

Abstract: A connection to releasably connect and disconnect to a pipe to a fitting provides a pipe fitting body for receiving a pipe and a retaining ring assembly located within the fitting body for retaining and releasing the pipe. The retaining ring assembly has axially extending inwardly angled resilient retaining tabs, each of which has a pipe retaining portion. When the pipe is inserted into the fitting body to an inserted position, the pipe retaining portions engage an indentation on the pipe to retain the pipe in the inserted position. Relative movement of the axially extending inwardly angled resilient retaining tabs with respect to the fitting body from the first locked position to a second unlocked position causes each axially extending inwardly angled resilient retaining tabs to disengage from the indentation on the pipe permitting removal of the pipe from the inserted position in the fitting body.

Abstract: A connection to releasably connect and disconnect to a pipe to a fitting provides a pipe fitting body for receiving a pipe and a retaining ring located within the fitting body for retaining and releasing the pipe. The retaining ring has axially extending resilient retaining tabs, each of which has a radially inwardly extending portion for engaging the pipe, and, a radially outwardly extending portion which extends through corresponding radial openings in the fitting body. When the pipe is inserted into the fitting body to an inserted position and the retaining ring is in the first locked axial position, the radially inwardly extending portions engage and retain the pipe in the inserted position.

Abstract: A pipe fitting having a first body and a second body that together at least partially define a fluid flow passage. The first body defines a first portion of the fluid flow passage that extends from a first end of the fluid flow passage to a first internal opening. The second body defines a second portion of the fluid flow passage that extends from a second internal opening to a second end of the fluid flow passage. The first body has a first interface surface that surrounds the first internal opening, the first interface surface having a plurality of anti-rotation grooves. The second body has a second interface surface that surrounds the second internal opening and engages with the first interface surface. The first internal opening is in fluid communication with the second internal opening. The second interface surface has a plurality of anti-rotation fingers that are each received by and engage with a corresponding one of the anti-rotation grooves.

Abstract: A connection to releasably connect and disconnect to a pipe to a fitting provides a pipe fitting body for receiving a pipe and a retaining ring located within the fitting body for retaining and releasing the pipe. The retaining ring has axially extending resilient retaining tabs, each of which has a radially inwardly extending portion for engaging the pipe, and, a radially outwardly extending portion which extends through corresponding radial openings in the fitting body. When the pipe is inserted into the fitting body to an inserted position and the retaining ring is in the first locked axial position, the radially inwardly extending portions engage and retain the pipe in the inserted position.

Abstract: A non-return valve having an accumulation damper movable relative to a housing and shaped like a bowl to accumulate condensate running down from the chimney. The non-return valve has a smaller floating damper made of a material having a density less than water for resting against the accumulation damper when the appliance is in standstill and sealing the drainage holes in the accumulation damper when the condensate accumulation is below a threshold. Once condensate accumulates in the accumulation damper beyond the threshold, the floating damper is buoyed by the condensate thereby breaking the seal with the drainage holes and permitting the condensate to drain through drainage holes in the accumulation damper. When the appliance is operational, exhaust from the appliance lifts the floating damper and, in some cases, the accumulation damper also, to permit exhaust of combustion gases up the chimney.