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 5996-01-201-2822
NSN 5985-01-501-5411
NSN 5855-00-198-3197
NSN 6135-01-010-0891
NSN 6130-01-073-3023
NSN 5910-01-314-7701
NSN 5990-00-306-0222
NSN 5990-00-140-4559
NSN 6110-01-361-8949
NSN 5996-01-050-6910
NSN 5920-00-072-1492
NSN 5950-00-235-9572