Topical Terminology > NOM
1 Definition
NOM
For NOM we have a term and definition in Plumbing.
NOM (Plumbing) 
Nominal. Usually refers to the Inside diameter of trade sizes of copper pipe and some CPVC pipes. Not for Iron Pipe connections. For example, a ½" NOM Comp. Fitting is actually 5/8" because ½" pipe has an OD of 5/8".
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