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 6620-00-150-6514
NSN 6220-01-437-8579
NSN 5975-01-099-6418
NSN 6130-00-468-1656
NSN 5835-01-477-0137
NSN 2925-01-471-3365
NSN 2925-00-915-1827
NSN 6105-01-424-0275
NSN 6135-01-119-0720
NSN 6650-01-134-6186
NSN 5975-01-254-2851
NSN 4140-01-551-1125