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 6320-01-350-5570
NSN 5855-01-430-0132
NSN 6610-01-189-3001
NSN 5905-01-023-4442
NSN 2925-00-947-9814
NSN 6645-01-282-3624
NSN 5935-01-474-8993
NSN 6130-00-067-8915
NSN 6105-01-647-4683
NSN 5920-01-063-4368
NSN 6685-01-628-8422
NSN 5965-01-365-5813