Features and Benefits: 3/8 female national pipe thread Maximum inlet pressure of 300 pounds per square inch Air flow of 99 standard cubic feet per minute Maximum temperature of 250 degrees Fahrenheit 3/8 FNPT G style plugs are made of case hardened steel and are plated to resist rust. G style plugs have a 1/2 basic flow size and a maximum of 300 PSI. Offering air flow of up to 99 SCFM Milton G style plugs are perfect for applications that require over 60 SCFM.