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 5965-01-106-4969
NSN 5925-01-481-2099
NSN 6650-00-629-3262
NSN 5925-00-062-3744
NSN 5905-01-238-8177
NSN 4140-01-034-9022
NSN 5905-00-710-1773
NSN 5855-00-337-3679
NSN 5935-01-640-7972
NSN 5990-01-015-7502
NSN 2925-01-519-1707
NSN 6135-00-078-9931