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 4140-01-187-1819
NSN 6320-01-119-3935
NSN 7035-01-442-7947
NSN 5999-00-050-3186
NSN 6650-00-466-1155
NSN 5935-01-578-9842
NSN 6130-00-828-5102
NSN 5910-00-116-8612
NSN 6685-01-166-5302
NSN 6650-00-005-7199
NSN 6645-01-573-7603
NSN 6320-01-522-0318