How are plumbing system components connected?
Fittings and valves connect all the pieces of the building plumbing system. Common fittings are elbows, tees, adapters and connectors. Use copper fittings with copper pipe and PVC fittings with PVC pipe. Use brass, PEX fittings with PEX. Connect pipes and fittings using the process that matches the type of pipe. Copper is soldered while PVC is welded with solvent. Connect PEX pipes using clamps. Fixtures, except tubs and showers, connect to shutoff valves, and to drain pipes with threaded fittings. Tubs and showers connect directly to the supply pipes with threaded fittings.