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 5920-01-025-6989
NSN 6220-01-586-7741
NSN 6105-00-546-2110
NSN 4140-01-451-7042
NSN 5965-01-089-8579
NSN 5990-01-250-4198
NSN 5905-01-521-2968
NSN 6105-01-182-7491
NSN 7035-01-364-0286
NSN 6110-01-281-7527
NSN 5999-01-649-8811
NSN 6645-00-137-1167