Plastic 4" Male Camlock Dust Plug Material_Carbon Steel San Francisco and some other

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

and valve is opened

Constructed of bronze

For example

Plastic 4" Male Camlock Dust Plug Material_Carbon Steel San Francisco and some otherType "DP" polypropylene 4 inch male camlock (Cam & Groove) dust plug. Dust caps and dust plugs are not to be used in pressure applications for safety and environmental reasons. Under no circumstances should cam and groove couplings be used for compressed air or steam service! Connections The male side of this adapter will only connect to 4 inch female camlock Warning: Polypropylene cam & groove should not be mixed with metal fittings. We recommend