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 4140-01-281-4058
NSN 5935-01-283-6863
NSN 5855-01-454-1538
NSN 4140-01-556-3312
NSN 6650-01-522-7462
NSN 5910-01-021-9172
NSN 6620-01-280-3516
NSN 2925-01-364-7926
NSN 6135-01-062-9356
NSN 5910-00-088-2026
NSN 6145-00-232-0813
NSN 5998-01-035-0835