Aluminum 3" Female Camlock x 3" Female NPT Inlet Size_5 Inch you need 2 1/2 inch

you need 2 1/2 inch plug which is the most common in the US

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Carbon Steel male National Pipe Tapered (NPT) to male National Pipe Tapered (NPT) fitting

San Francisco and some other locations use a different thread type or size

Aluminum 3" Female Camlock x 3" Female NPT Inlet Size_5 Inch you need 2 1/2 inchGlobal type "D" aluminum 3 inch female camlock (Cam & Groove) coupler to 3 inch female 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 female threaded side of this adapter will only connect to a 3 inch male National Pipe Tapered (NPT) thread, for example, PVC or metal pipe fitting How it works To