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 5999-01-334-9811
NSN 6650-01-508-3651
NSN 6150-01-100-3908
NSN 5855-01-246-4274
NSN 6130-01-067-3777
NSN 5990-01-421-5342
NSN 5935-01-208-0369
NSN 6645-01-354-7352
NSN 6240-01-220-0492
NSN 6620-01-424-6925
NSN 5915-01-541-8174
NSN 5930-01-543-8770