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 5990-01-322-9781
NSN 6320-01-631-7828
NSN 4140-00-193-8879
NSN 4140-01-306-1421
NSN 6620-01-178-4771
NSN 6685-01-371-0562
NSN 6650-01-394-2646
NSN 6110-00-809-1401
NSN 5915-01-203-6118
NSN 6610-01-284-6968
NSN 5935-00-631-6196
NSN 6610-01-257-5808