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 6320-01-081-7748
NSN 6240-01-210-1927
NSN 5965-00-583-4865
NSN 2925-01-400-2286
NSN 7035-01-183-7550
NSN 6240-01-093-2987
NSN 5965-01-325-0627
NSN 5965-01-394-6702
NSN 5960-01-079-7797
NSN 5990-00-050-7693
NSN 6220-01-152-2637
NSN 5965-01-367-7380