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 6220-00-418-1961
NSN 6240-01-649-1520
NSN 5950-00-937-1177
NSN 5920-01-429-0354
NSN 5960-00-820-5202
NSN 2925-01-113-6904
NSN 5945-00-494-9018
NSN 2925-01-501-1104
NSN 6650-01-623-3078
NSN 5835-01-332-2867
NSN 6135-01-512-8740
NSN 6620-00-854-5024