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 6130-01-178-7503
NSN 4140-01-634-0330
NSN 6110-00-724-1221
NSN 5925-01-044-0576
NSN 6135-00-016-0071
NSN 6645-00-081-4298
NSN 4140-00-287-9199
NSN 5950-01-198-6998
NSN 5960-01-624-1170
NSN 5965-00-899-0453
NSN 6610-01-412-5776
NSN 7035-00-679-9027