The following lines were added (+) and removed (-):
=== Transition Coupling PEX to CPVC ===[[File:120x120_12PEXTransitionPVC.jpg|more]]This coupling allows for PEX line to be connected to existing CPVC plastic water line. Some hybrid residential water systems have CPVC, galvanized, and copper at different places in the plumbing, due to various upgrades, repairs, and remodeling over the life of the home. This is especially common in older homes. When removing old galvanized pipe, a plumber may choose to leave some places that have been converted to CPVC in place. This 1/2" PEX to CPVC coupling allows PEX to be connected to existing CPVC pipe. The illustration below shows the inside of the coupling, which is plastic. While the outside is copper, the plastic inside is meant to accept insertion of the plastic 1/2" CPVC pipe. Use PVC primer (purple in color) and CPVC cement to seal the pipe to the coupling.[[File:120x120_12PEXTransitionPVCinside.jpg|none]]Because the purple primer will soften the pipe surface, it is important to apply solvent cement to the pipe and fittings while the primer is still wet to achieve maximum bond strength. Coat the plastic inside of the coupling as well as the CPVC pipe you are connecting it to with the purple primer before applying the adhesive cement (CPVC pipe glue). == PVC Plastic ==These are three different types of plastic pipe used in plumbing applications. PVC is Poly(Vinyl) Chloride, CPVC is Chlorinated Poly(Vinyl) Chloride and ABS is Acrylonitrile-Butadiene-Styrene. PVC and ABS pipe are normally used for drain, waste and vent (DWV) systems, while CPVC is used for water distribution systems. === CPVC Water Supply Line ===CPVC (Chlorinated Polyvinyl Chloride) is a chlorinated form of PVC that is accepted by building code in most areas for the installation of water supply lines.