Stainless Steel 3" Female Camlock x 3" Male NPT Inlet Size_4 Inch They are usually labeled FDC

They are usually labeled FDC (Fire Department Connection) and/or AUTO SPKR (Automatic Sprinkler)

Code of Federal Regulations Title 46

The result is the GPM

Applications

75% lead-free

Stainless Steel 3" Female Camlock x 3" Male NPT Inlet Size_4 Inch They are usually labeled FDCGlobal type "B" stainless steel 3 inch female camlock (Cam & Groove) coupler to 3 inch male NPT threads. Under no circumstances should cam and groove couplings be used for compressed air or steam service! Connections The female side of this adapter will only connect to 3 inch male camlock The male threaded side of this adapter will only connect to a 3 inch female National Pipe Tapered (NPT) thread, for example, PVC or metal pipe fitting How it works