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 6220-01-154-7699
NSN 5920-01-421-9154
NSN 5910-01-445-1690
NSN 5835-01-136-3394
NSN 5895-01-205-7681
NSN 5920-00-173-4434
NSN 4140-01-647-0707
NSN 5855-01-307-1159
NSN 5835-00-466-3075
NSN 6685-01-259-3006
NSN 5999-00-053-4119
NSN 5965-01-396-7508