This ANSI/ASME/ASTM/NSF-certified, class 125, 1 1/4-inch, square head plug (solid) has an MNPT connection type. It is used in general-purpose pipe connection applications. This product's working temperature ranges between -20 Degrees F and 150 Degrees F. Its maximum operating pressure is 299 PSI and is made of brass for good corrosion resistance.