ColorFit by Milton Coupler & Plug Kit - (M-Style, Red) - 1/4" NPT, (5-Piece) M-STYLE: Milton M-style, ColorFit M-style, + red competitor couplers/plugs are all compatible!. DURABLE: Scratch- steel design in an anodized coating for optimal wear vs. aluminum sleeves. EASY MATCH: Use color to distinguish between air lines (e.g. high pressure vs. low pressure).. COLOR: Red to Red matching - (M/Industrial) air coupler/plug fittings, easy push to connect.. INCLUDES: 3 Male plugs, 1 Female plug, + 1 Female coupler (all 1/4 NPT) S-305MKIT Prop65 information pending -