Siamese Fire Department Connections are the most common FDC types used to supplement a building's water supply to either an automatic fire sprinkler or standpipe system.
This UL and FM approved 2 1/2" x 2 1/2" x 4" single clapper FDC is available in either a 90 body or a straight body. Comes standard with NST threaded swivels.
Now also available in NYCC threads.
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Double Clapper Siamese Fire Department Connection
All Fire Department Connections (FDCs)