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 6645-01-633-1852
NSN 7035-00-585-2113
NSN 5998-00-526-9253
NSN 5985-00-953-1519
NSN 6220-01-370-4215
NSN 6650-01-025-7425
NSN 5985-01-324-1768
NSN 5985-00-177-2960
NSN 5985-01-501-7298
NSN 5905-00-775-5733
NSN 5998-00-415-8000
NSN 5999-01-422-2065