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 5920-01-362-3866
NSN 6645-01-096-9719
NSN 5975-00-435-7744
NSN 5905-01-428-2502
NSN 6685-01-492-4302
NSN 5950-01-284-1477
NSN 5999-01-303-8404
NSN 6650-00-262-2324
NSN 6240-01-268-0409
NSN 5855-00-532-0025
NSN 6620-00-725-7289
NSN 5998-01-386-4467