CPVC
CPVC is a rigid cream-colored plastic pipe rated for hot water that joins with solvent cement, used for water supply as a lower-cost alternative to copper.
CPVC stands for chlorinated polyvinyl chloride, a cousin of the white PVC used on drains but treated so it can handle the temperature and pressure of hot water supply. It is rigid, usually cream or off-white, and pieces are bonded with a primer and solvent cement that chemically welds the joint, no torch required. That makes it friendlier to install than copper while still standing up to hot lines, which standard PVC cannot do.
Homeowners see CPVC in homes built or repiped in certain regions and eras, and sometimes as the short transition piece off a water heater where PEX is not rated to sit. It is inexpensive and quiet, but it grows more brittle with age and can crack if struck or if the wrong glue or a petroleum product touches it. Cold attics and crawlspaces are hard on it, and a CPVC line that freezes tends to shatter rather than split.
Where local code allows all three, the choice usually comes down to PEX for flexibility, copper for longevity, and CPVC as a middle path that some plumbers still favor for its heat rating and clean glued joints. Mixing CPVC with PEX or copper is done with threaded transition fittings rather than glue.
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- Push-Fit Fitting (SharkBite) : A push-fit fitting is a no-tools connector that seals a pipe joint when you simply push the pipe in, working across copper, PEX, and CPVC, with SharkBite the most familiar brand name.
- Galvanized Pipe : Galvanized pipe is old steel water pipe coated in zinc that corrodes and clogs from the inside over decades, a common cause of low pressure and rusty water in pre-1970 homes.
- Polybutylene Pipe : Polybutylene is a gray flexible plastic supply pipe installed from the late 1970s to the mid-1990s that is prone to sudden failure and is now widely flagged by insurers and inspectors.
- Dielectric Union : A dielectric union is a coupling with a non-conductive separator that joins two different metals, such as copper and steel, to stop the galvanic corrosion that would otherwise eat the joint.