Plumbing fittings vary by size, purpose and material. You often must tie together pipes of different materials with transition fittings. The materials in common use today — copper, PVC and CPVC ...

PEX fittings are more expensive than metal or PVC fittings. The vent stack in any building is the main vent pipe connecting the sewer to the roof. It’s that two- to three-inch pipe you see ...