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 5915-01-442-9810
NSN 6145-00-752-1920
NSN 6130-00-808-2296
NSN 5990-01-328-9846
NSN 7035-01-422-4642
NSN 5975-00-853-5955
NSN 6130-01-101-9026
NSN 5925-00-259-2098
NSN 5985-01-041-4175
NSN 6130-01-130-6966
NSN 5965-01-386-2988
NSN 4140-01-522-1051