Features and Benefits: 1/4" female national pipe thread; Maximum pressure of 300 pounds per square inch; Air flow of 40 standard cubic feet per minute; Maximum temperature of 250 degrees Fahrenheit; 1/4" FNPT T style plugs are made of case hardened steel and plated to resist rust. T Style plugs are perfect for industrial applications and offer a 1/4" basic flow size. T style plugs have a maximum inlet pressure of 300 PSI and air flow of 40 SCFM.