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 6320-00-593-0379
NSN 6105-00-405-4799
NSN 7035-00-225-6499
NSN 6220-01-025-1373
NSN 5990-01-507-7495
NSN 6645-01-261-0056
NSN 2925-01-129-1261
NSN 4140-01-271-6960
NSN 6645-01-018-7664
NSN 2925-00-275-1807
NSN 6620-01-314-3635
NSN 5935-01-093-1483