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 4140-01-136-9802
NSN 4140-01-352-2924
NSN 6610-01-416-0652
NSN 2925-01-103-7019
NSN 5960-00-140-9583
NSN 6240-00-284-1457
NSN 6135-01-096-1452
NSN 6650-01-338-9998
NSN 5915-01-455-8577
NSN 6105-01-374-2237
NSN 6240-01-023-7720
NSN 5930-00-188-6137