1/4 FNPT M style plugs have a 1/4 basic flow size and air flow of 40 SCFM. Made of case hardened steel and plated to resist rust, M style plugs have a maximum pressure of 300 PSI. Product Features:1/4 female national pipe threadMaximum inlet pressure of 300 pounds per square inch40 standard cubic feet per minuteMaximum temperature of 250 degrees Fahrenheit
