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 6620-01-048-4145
NSN 4140-01-555-8190
NSN 5985-01-224-7522
NSN 5999-01-273-7927
NSN 6105-01-431-8289
NSN 5990-01-561-7802
NSN 5910-00-332-5590
NSN 5985-01-116-6429
NSN 6150-01-374-1504
NSN 5895-01-580-5485
NSN 5975-01-227-2722
NSN 6650-01-528-8230