A relatively thin metallic item, having a concave or cupped contour, designed to effect its own seal by compression against the circumference of a hole. It is used as a blowout plug in boilers, engines, and the like to relieve the pressure created by the expansion of fluids caused by heat or freezing.
Classification: Parts for steam or other vapor generating boilers and super-heated water boilers, except heat exchangers
NSN 5920-01-046-9891
NSN 4140-01-198-5652
NSN 5999-00-370-0797
NSN 6685-00-449-7087
NSN 5905-01-104-2126
NSN 5855-01-178-8732
NSN 6650-00-092-8244
NSN 5910-01-388-1146
NSN 6620-00-379-2856
NSN 4140-00-356-1979
NSN 5895-00-729-5479
NSN 5920-01-610-7598