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 5835-01-182-1966
NSN 5998-01-179-5890
NSN 2925-01-507-4797
NSN 6240-01-476-7357
NSN 5975-01-136-4988
NSN 5975-00-064-8685
NSN 5920-01-290-3771
NSN 5960-01-144-1515
NSN 5855-01-074-3336
NSN 6145-01-354-3796
NSN 6685-01-590-9375
NSN 5935-00-207-5796