Milton 783BK 1/4" MNPT T Style Plug - Box of 250 1/4" MNPT T style plugs are made of case hardened steel and are plated to resist rust. T style plugs have a 1/4" basic flow size with maximum pressure of 300 PSI. With air flow of 40 SCFM, Milton T style plugs are ideal for industrial applications. 1/4" male national pipe thread Maximum 300 pounds per square inch Air flow of 40 standard cubic feet per minute Maximum temperature of 250 degrees Fahrenheit 1/4" male national pipe thread Maximum 300 pounds per square inch Air flow of 40 standard cubic feet per minute Maximum temperature of 250 degrees Fahrenheit