Milton 727BK 1/4" MNPT M Style Plug - Box of 250 1/4" M style MNPT plugs are the industry standard style plugs. These steel plugs have a 1/4" basic flow size, maximum air flow of 40 SCFM and a maximum inlet pressure of 300 PSI. 1/4" male national pipe thread Maximum inlet pressure of 300 pounds per square inch Maximum air flow of 40 standard cubic feet per minute Maximum temperature of 250 degrees Fahrenheit 1/4" M style MNPT plugs are the industry standard style plugs. These steel plugs have a 1/4" basic flow size, maximum air flow of 40 SCFM and a maximum inlet pressure of 300 PSI. Maximum inlet pressure of 300 pounds per square inch Maximum air flow of 40 standard cubic feet per minute Maximum temperature of 250 degrees Fahrenheit 1/4" male national pipe thread Maximum inlet pressure of 300 pounds per square inch Maximum air flow of 40 standard cubic feet per minute Maximum temperature of 250 degrees Fahrenheit