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 5999-01-308-1559
NSN 6620-01-118-2337
NSN 6240-01-066-0110
NSN 6150-01-395-0550
NSN 6105-01-634-0322
NSN 5895-01-536-1098
NSN 2925-01-294-0585
NSN 5855-00-014-5008
NSN 5920-01-234-5914
NSN 5835-01-067-0075
NSN 5855-01-050-4944
NSN 6620-01-457-9476