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 5855-01-235-5491
NSN 5915-01-253-5743
NSN 6220-00-052-0700
NSN 5975-01-411-5626
NSN 5990-00-004-4158
NSN 5925-00-536-4444
NSN 4140-01-350-3277
NSN 6645-01-633-1852
NSN 6685-00-484-2167
NSN 5965-00-348-4165
NSN 6650-01-463-6495
NSN 5935-01-449-2587