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 5935-01-535-1516
NSN 6650-00-197-7563
NSN 6145-01-605-9983
NSN 6320-01-414-4568
NSN 6610-01-608-5285
NSN 5985-01-485-0456
NSN 4140-01-492-6734
NSN 5895-01-135-6289
NSN 5996-01-023-7896
NSN 5835-01-460-0582
NSN 5965-01-061-6871
NSN 5975-00-203-8416