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 5990-01-267-6971
NSN 4140-01-532-3713
NSN 6110-00-141-1966
NSN 5895-00-292-2872
NSN 5950-01-127-2119
NSN 6620-01-456-0529
NSN 5910-00-182-8755
NSN 5975-01-092-8655
NSN 5996-01-468-8809
NSN 5990-00-552-1611
NSN 6105-01-651-8174
NSN 6620-00-524-3596