Material is steel, federal standard no. 66; steel no.S 1008 to 1022
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 5999-01-180-4156
NSN 5915-01-484-1820
NSN 6620-00-160-0844
NSN 6685-00-853-8835
NSN 5950-00-440-3648
NSN 6105-01-579-3695
NSN 5990-01-052-1987
NSN 5950-01-359-6209
NSN 5990-00-489-7834
NSN 5855-01-006-1827
NSN 5990-00-202-5127
NSN 6610-01-156-0810