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 5905-01-500-3577
NSN 6130-00-082-1262
NSN 5905-00-959-6751
NSN 5920-01-153-2690
NSN 5930-01-315-9947
NSN 5999-00-047-4614
NSN 5960-01-219-5504
NSN 4140-00-900-6102
NSN 6645-01-442-6476
NSN 6105-00-408-5552
NSN 5960-01-539-1956
NSN 2925-00-480-9068