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 5920-00-981-5803
NSN 6320-01-607-1491
NSN 6150-01-352-5599
NSN 7035-01-535-6945
NSN 5985-01-430-3497
NSN 6130-01-329-5461
NSN 5975-01-411-6054
NSN 6105-01-388-4514
NSN 2925-01-166-4589
NSN 5915-01-051-4786
NSN 5950-01-189-6325
NSN 5950-00-521-1570