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 6645-00-838-6939
NSN 5905-00-171-2529
NSN 5950-01-295-7942
NSN 5905-01-164-6299
NSN 5950-01-333-0326
NSN 5960-01-234-4388
NSN 5999-01-557-9638
NSN 6645-00-716-8049
NSN 5990-01-633-9503
NSN 5996-01-351-6181
NSN 5975-00-458-3038
NSN 5915-01-090-0478