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 5920-01-412-4742
NSN 5945-01-336-6542
NSN 5950-01-627-9228
NSN 5855-01-658-4510
NSN 6220-00-204-5538
NSN 5960-01-205-6629
NSN 5975-00-149-7647
NSN 5965-01-237-3342
NSN 5835-00-980-0468
NSN 5990-01-463-2279
NSN 5935-01-073-2425
NSN 5935-00-689-1416