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 6610-01-556-0534
NSN 6220-01-467-1941
NSN 6220-01-080-6362
NSN 6150-00-227-8983
NSN 2925-01-009-9560
NSN 5999-01-044-8325
NSN 5985-01-573-5000
NSN 5935-01-512-7019
NSN 5935-00-788-8552
NSN 5975-00-396-2255
NSN 6685-01-651-9548
NSN 6610-01-026-1701