Milton Industries S764 "V" Style Hi-Flo 1/4" Female NPT Coupler - "V" Style Hi Flow couplers and plugs are specifically designed for use with HVLP spray guns. Suitable for use with hi volume air tools also. Always use the (-1) Steel plug with impact tools. "V" Style couplers will also accept "M" and "A" Style plugs. Max. inlet pressure: 300 PSI, Max. temp: 250F, Air Flow: 74 SCFM.