Milton multi-style couplers are unique in that one coupler is compatible with three different styles of plugs versus having to have muliple different couplers on hand for different plugs. These couplers work with styles A, M, and T, and are made of brass for high corrosion resistance. They feature a 1/4" basic flow which allows up to 42 SCFM. This one features 1/4" N.P.T. male thread.