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 4140-01-296-7168
NSN 2925-00-767-4245
NSN 5905-01-431-2380
NSN 7035-01-165-0234
NSN 6650-00-732-5031
NSN 6130-00-833-7763
NSN 5835-01-519-3834
NSN 5920-01-580-7747
NSN 6685-00-754-4111
NSN 5975-01-354-6251
NSN 6645-00-371-1861
NSN 6320-01-648-5538