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 5990-01-440-7135
NSN 5945-01-101-0495
NSN 5999-00-459-5743
NSN 5945-01-563-1358
NSN 6110-01-586-8161
NSN 5925-01-340-1185
NSN 5920-01-291-5503
NSN 5985-01-625-1490
NSN 6105-00-173-7166
NSN 5985-01-315-2827
NSN 5930-01-256-6515
NSN 6130-01-432-0514