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 5985-01-252-8822
NSN 5855-00-337-3679
NSN 5985-01-575-1397
NSN 5996-01-064-0630
NSN 6220-01-303-0996
NSN 4140-01-364-7845
NSN 5945-00-939-2297
NSN 5915-01-573-0218
NSN 5960-01-142-1995
NSN 6220-01-573-7639
NSN 6685-00-272-5483
NSN 6220-01-568-2671