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 5945-01-242-9989
NSN 6240-01-169-1686
NSN 5950-01-431-5338
NSN 6320-01-519-8767
NSN 5930-01-166-2921
NSN 5999-01-310-9868
NSN 4140-01-115-5977
NSN 5905-01-043-1334
NSN 6135-01-300-8455
NSN 5950-01-413-0441
NSN 6685-01-243-0372
NSN 5935-01-361-2973