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 5975-00-225-8722
NSN 5920-00-018-1452
NSN 5950-00-934-2820
NSN 5920-01-025-6989
NSN 6685-01-214-0359
NSN 5835-01-111-0969
NSN 7035-01-319-7066
NSN 6240-01-322-3055
NSN 5998-00-240-0019
NSN 5999-01-142-2090
NSN 5835-01-519-2916
NSN 6620-01-236-0138