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 5910-00-406-6442
NSN 6685-00-361-0332
NSN 6610-01-179-6859
NSN 6240-00-827-0889
NSN 6150-00-900-4423
NSN 4140-00-281-4493
NSN 5905-01-385-4643
NSN 6150-01-449-9248
NSN 4140-01-196-2107
NSN 6320-00-937-5625
NSN 6685-00-473-8208
NSN 6240-01-437-6888