Milton (S-210) 1/4" NPT M-Style Coupler and Plug Kit, (12-Piece) BASIC FLOW SIZE: All 1/4" body size air fittings. 1/4" NPT. Buna-N seals. KWIK-CHANGE: Interchangeable/compatible with most manufacturers. Easy push to connect. MAXIMUM: 40 SCFM. 300 PSI. Temperatures up to 250 degrees F. QUALITY: Durable brass couplers. Case-hardened steel plugs, plated to resist rust and corrosion. M-STYLE KIT INCLUDES: (2) Female Couplers, (8) Male Plugs, and (2) Female Plugs. (Milton #715, #727, #728)