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 4140-01-602-2130
NSN 5920-00-936-7293
NSN 5895-00-503-1576
NSN 5990-01-432-4984
NSN 6645-01-121-0530
NSN 5930-00-014-2735
NSN 5910-01-529-7205
NSN 5990-00-932-3070
NSN 5920-01-547-4766
NSN 6135-01-196-7399
NSN 7035-01-451-6421
NSN 6130-01-056-5251