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 5960-01-593-4760
NSN 6145-01-359-2378
NSN 5999-01-365-4557
NSN 4140-00-480-1561
NSN 6645-00-255-8182
NSN 5935-00-262-5173
NSN 5835-01-364-6830
NSN 2925-00-707-6770
NSN 5990-00-232-3965
NSN 5835-01-307-8954
NSN 6135-01-132-6310
NSN 5950-01-149-1190