Milton S-728 1/4" FNPT M Style Plug - Pack of 2 1/4" female national pipe thread Maximum inlet pressure of 300 pounds per square inch 40 standard cubic feet per minute Maximum temperature of 250 degrees Fahrenheit Made in USA The Industry Standard M Style Plug Plug M Style 2 per pack 1/4" Basic Flow Size 1/4" Female NPT Steel plug Air flow 40 SCFM Complies with military specification MIL-C-4109