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 5985-01-463-3283
NSN 5975-00-990-7024
NSN 5920-01-373-6949
NSN 6130-01-381-1046
NSN 6220-00-432-1437
NSN 5905-01-026-9636
NSN 5835-01-354-0566
NSN 5990-01-168-6797
NSN 6130-01-172-3734
NSN 4140-01-534-3429
NSN 6650-00-087-1569
NSN 6320-01-332-1977