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 5920-00-451-6847
NSN 6220-01-487-0541
NSN 5835-01-442-6482
NSN 2925-01-291-9997
NSN 5998-01-543-0146
NSN 5990-01-604-0862
NSN 4140-00-727-3731
NSN 5905-01-415-0869
NSN 6220-01-333-0702
NSN 5895-00-616-4412
NSN 5930-01-084-6431
NSN 6150-00-679-3285