3/8 Male Body H style. Milton® H Style couplers are used in larger tool applications requiring more SCFMs. 300 PSI Maximum. Complete with Buna-N Seal Please see below for more features and specifications. H style couplers are heavy duty steel. Milton V Style Milton Industries, Inc. 3/8 In. MNPT V Style High Flow Coupler-S-767... Milton Air Fittings Milton H Style Coupler 3/8 Male NPT Kwick Change Coupler USA Made S-1 – Compressor Source 250°F, Air flow: 67 SCFM, Seal: Buna-N, Coupler , H Style , 3/8 Basic Flow Size , 3/8 Male NPT , Steel Milton H-style industrial interchange couplers are steel, plated to prevent rust