1/4" female national pipe thread. 1/4" FNPT M style plugs have a 1/4" basic flow size and air flow of 40 SCFM. 40 standard cubic feet per minute.
S728 MILTON 1/4 NPT FEMALE M STYLE AIR LINE COUPLER
Milton S728 1/4" M-Style Female Plugs, 2/Pack, Made In USA
Milton 1/4" NPT Lever Style 4' Safety Extension Blow Gun 159 Auto Body Air Tools
Milton® 1/4" NPT Breather Vent
Milton 1/2" NPT Heavy Duty Air Compressor Line Pressure Regulator
S699 MILTON 1/4" NPT FEMALE AIR CHUCK
