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 4140-00-628-3546
NSN 5945-01-054-0213
NSN 5925-00-286-8502
NSN 5905-01-263-5611
NSN 6150-00-479-0443
NSN 5998-01-025-4118
NSN 5835-00-400-5056
NSN 6650-01-531-0063
NSN 6220-00-379-4044
NSN 6220-01-307-2447
NSN 5835-00-807-5632
NSN 5950-01-471-6778