Milton (S-219) 1/4" FNPT M-Style Safety Coupler and Plug Kit - 5 Piece SAFETY M-STYLE KIT: Milton M-style Safety Air coupler fittings prevent possible injury or damage + competitor couplers/plugs are all compatible. KWIK-CHANGE: Interchangeable/compatible with most manufacturers NPT: 1/4" male & female national pipe thread size. Durable case hardened steel plugs and composite plastic coupler. Buna-N seals. MAXIMUM: 36 standard cubic feet per minute (SCFM). 300 PSI inlet pressure. Temperatures up to 250 degrees F. INCLUDED IN MILTON M-STYLE AIR TOOL ACCESSORY KIT: #S-99705, #727, #728 M style kit includes three #727 plug, one #728 plug and one #99705 fitting 1/4" Basic flow size Air flow of 40 standard cubic feet per minute (except button coupler)