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 4140-01-430-7170
NSN 5920-01-548-0094
NSN 6320-01-556-2011
NSN 6650-01-243-7789
NSN 5935-00-683-7894
NSN 5950-01-451-0802
NSN 5910-01-356-8075
NSN 6650-01-431-9625
NSN 5999-00-977-9952
NSN 6620-01-114-6374
NSN 2925-01-224-1885
NSN 6610-00-530-3955