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
NSN 6220-01-161-8199
NSN 5965-00-267-4173
NSN 6610-00-703-2489
NSN 5996-00-960-8252
NSN 5975-01-178-5709
NSN 5975-01-523-7575
NSN 5925-00-677-8320
NSN 6650-01-658-0182
NSN 5996-00-601-0472
NSN 6105-00-239-2166
NSN 5935-01-206-0502