The Prevost PRVERP076202 3/8" Fnpt Plug is a plug that is used to connect a 3/8" FNPT pipe to a water line. It is made of brass and has a male thread on one end and a female thread on the other.
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Prevost PRVESI071202 3/8" Fnpt Couplers are designed to connect two pieces of pipe. They are made of brass and have a 3/8" female thread on one end and a 3/8" male thread on the other.