Milton S-1802 1/4" NPT P Style Coupler and Plug 1/4" female national pipe thread 1/4" male national pipe thread 3/8" basic flow size 68 standard cubic feet per minute Maximum inlet pressure of 300 pounds per square inch; Made in USA Milton is your number 1 source for Quality Air Accessories Since 1943 Milton has been producing Quality Air Accessories Milton covers automotive, industrial, hardware, agriculture, heavy-duty fleet and MRO markets