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 4140-00-078-9357
NSN 5945-01-113-9532
NSN 5915-01-032-4475
NSN 6620-01-540-4298
NSN 5985-01-464-1537
NSN 2925-00-371-2285
NSN 5905-01-494-2468
NSN 5999-00-014-6587
NSN 5855-01-472-2302
NSN 6220-01-459-8017
NSN 5905-00-900-5490
NSN 5990-00-339-2084