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 4140-01-660-1317
NSN 6685-01-309-7644
NSN 4140-01-460-3026
NSN 5910-01-481-1515
NSN 5930-01-120-5427
NSN 2925-01-643-2112
NSN 5965-01-303-6105
NSN 6620-00-244-0965
NSN 6685-01-254-0017
NSN 2925-00-005-1618
NSN 7035-01-330-1146
NSN 5945-01-546-7900