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 5895-00-494-8471
NSN 6135-00-725-3941
NSN 4140-01-432-7433
NSN 6135-01-217-3292
NSN 5910-01-168-1938
NSN 5855-01-565-8109
NSN 6610-01-141-9979
NSN 4140-00-862-5644
NSN 6610-00-681-0590
NSN 6240-01-628-3068
NSN 4140-01-630-2131
NSN 2925-00-660-8131