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 4140-01-205-0197
NSN 6240-01-076-1793
NSN 5935-00-370-1345
NSN 5920-01-351-7936
NSN 6320-01-177-3192
NSN 6130-01-226-1416
NSN 5935-00-139-1279
NSN 6130-01-023-8803
NSN 6320-01-512-2031
NSN 5960-01-117-1887
NSN 6135-00-086-7530
NSN 6220-00-171-8638