Buying Guide

AHEAD OF THE FLOW
®
Revised 4/26/2019
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THREADED CONNECTIONS - ABS, CPVC, & PVC pipe less than
Schedule 80 wall should not be threaded. Most codes require
transition from one material to another by use of appropriate
adapter fittings. NIBCO offers a complete line of adapters for
ABS, CPVC, & PVC.
Common thread sealants should not be used on threaded ABS,
CPVC, or PVC joints. When necessary, PTFE pipe tape can be
used.
CONNECTING CPVC TO METAL PIPE OR FITTINGS - The recom-
mended methods of joining CPVC tube to metal threaded valves
or piping are to use one of the special transition unions or a
CPVC adapter with a threaded-brass insert. Threaded plastic-
to-metal connections are not recommended. The difference in
the rates of expansion of CPVC and metal may cause leakage
in threaded joints.
CONNECTING CPVC TO HOT WATER HEATER
An approved temperature/pressure relief valve should be
assembled to the hot water heater so that the probe or sensing
element enters the water at the top of the heater. Using metal
nipples, extend the metal piping at least 12 inches from the
water heater on both the cold water supply and the hot water
discharge lines. Special transition unions or CPVC adapters
with a threaded-brass insert must be used to join the CPVC
tube to the nipples. Do not use CPVC pipe and fittings with
commercial type non-storage water heaters.
Adapting Plastic Piping to Other Piping Materials