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 5930-01-357-6923
NSN 4140-01-071-2977
NSN 6620-00-209-0767
NSN 5930-00-967-3405
NSN 5990-00-925-6614
NSN 6610-01-308-6148
NSN 5930-01-495-1025
NSN 5975-01-045-9683
NSN 5990-01-043-7100
NSN 5985-01-480-6043
NSN 6110-01-035-0427
NSN 6105-01-459-4831