Brass 3" Female Camlock x 3" Female NPT (USA) Inlet Size_3 Inch The male threaded side of Model:3113 (7.5 TPI x 2.940 OD) Male Size_4 Inch Aluminum Female Garden Hose FABV1515

The male threaded side of this adapter will only connect to a 6 inch female National Pipe Tapered (NPT) thread

The female side of this adapter will only connect to 6 inch male camlock

Finished in bright orange to distinguish them from regular camlock to NPT "pipe thread" cam and grove fittings

Type "D" brass 4 inch female camlock (Cam & Groove) coupler to 3 inch female NPT threads

If you have any doubt it is best to contact your local fire department for size and thread type in your area

Brass 3" Female Camlock x 3" Female NPT (USA) Inlet Size_3 Inch The male threaded side of Model:3113 (7.5 TPI x 2.940 OD) Male Size_4 Inch Aluminum Female Garden Hose FABV1515 The male threaded side of this adapter will only connect to a 6 inch female National Pipe Tapered (NPT) thread The female side of this adapter will only connect to 6 inch male camlock