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 6645-01-346-4505
NSN 5920-01-037-6801
NSN 5895-00-707-6663
NSN 6220-01-632-3851
NSN 5855-01-500-0449
NSN 5999-01-438-7906
NSN 5950-00-333-9739
NSN 5925-01-503-1740
NSN 5920-00-224-1634
NSN 5915-01-037-6219
NSN 5835-01-173-1578
NSN 6685-00-422-9900