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 6650-00-078-5773
NSN 6620-01-648-1594
NSN 5835-01-442-6482
NSN 6110-01-077-5543
NSN 6220-01-100-5093
NSN 5960-01-052-9577
NSN 5945-00-185-4815
NSN 5960-00-933-5765
NSN 4140-00-839-4911
NSN 6320-01-162-5977
NSN 5999-01-041-5880
NSN 6320-01-145-9013