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 5920-00-470-2903
NSN 5935-00-163-0009
NSN 6610-01-027-1641
NSN 5960-01-350-2925
NSN 6620-00-349-4703
NSN 5998-01-192-9064
NSN 5975-01-357-9478
NSN 6105-01-555-8757
NSN 5990-01-054-3332
NSN 5998-01-166-2466
NSN 5925-01-526-9741
NSN 2925-00-831-7024