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 6220-01-374-0431
NSN 5990-01-080-0097
NSN 5996-00-181-0207
NSN 6240-00-737-2775
NSN 6145-01-183-0958
NSN 5950-00-354-3316
NSN 5905-01-556-0099
NSN 5998-00-879-7656
NSN 5965-00-493-6008
NSN 6130-00-091-9335
NSN 5999-01-441-5764
NSN 5975-00-267-2776