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 5905-00-153-4822
NSN 5998-01-299-1410
NSN 5920-00-527-9473
NSN 6220-01-020-6592
NSN 2925-00-215-4954
NSN 5965-01-155-3131
NSN 5965-01-418-1760
NSN 6685-01-123-9275
NSN 6130-01-132-9611
NSN 6220-00-099-9192
NSN 6110-01-364-0966
NSN 5990-01-498-0641