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 5895-01-602-6868
NSN 6620-01-369-5876
NSN 4140-01-400-3610
NSN 6220-00-921-6948
NSN 6240-01-416-5837
NSN 6685-00-679-9965
NSN 5985-00-771-2330
NSN 5965-01-325-0627
NSN 5930-01-487-6597
NSN 5999-01-063-4838
NSN 6150-01-607-1328
NSN 6320-01-618-7800