1/4" male national pipe thread. 1/4" M style MNPT plugs are the industry standard style plugs. Maximum air flow of 40 standard cubic feet per minute.
1/4" Male NPT M-Style Plug, 2 Pack MIL-S727
Blue-Point AHC21MD 1/4” NPT Male Steel Plug FOUR PACK!! Brand New!!
Milton 761 Hi-Flo "V" Style 1/4" Female NPT (FNPT) Brass Plug - 10 Pack
Milton S684 1/8 NPT AIR TANK VALVE 2 PACK MFG IN USA PRESSURE TESTING
Milton S791 1/4" L-Style Male Coupler Plugs, 2 / Pack
Milton S-646-1 1/4" X 3/8" Male Hex Nipple - 2 PACK
