McMaster 4627K335 Medium Pressure Iron Pipe Fitting, Plug with External Square Drive, 1 NPT SRM12 0600 SL you'll have confidence in your you'll have confidence in your torque measurements every time Standards Meets C1 Food Service Applications these can handle medium pressure applications Pressure Rating Medium Pressure Shape Cap and Plug Drive Style External Square Fitting Type Plug Fitting Connection NPT Male Pipe Size 1 Construction Solid Pressure Class 300 Body Shape Square Material Iron Maximum Pressure @ Temperature 400 psi @ 72° F Maximum Steam Pressure @ Temperature 300 psi @ 550° F Certification UL Listed Connects To Pipe Class 300 Material Steel For Pipe Material Steel For Pipe Schedule 80 For Use With Air