This ASTM/ANSI/ASME-certified, class 150, 1/4-inch hex head plug has an MNPT connection type. The male thread of this pipe fitting has a pre-applied PTFE thread sealant for extra leak protection. It is used in air, natural gas, oil, potable water, and steam-based applications and is made of 304 stainless steel for good corrosion resistance. This product has a maximum operating pressure of 150 PSI.