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 6220-01-621-0857
NSN 5915-01-250-6809
NSN 6240-01-485-6398
NSN 5905-01-435-5379
NSN 2925-01-277-0873
NSN 6130-00-815-2293
NSN 6220-01-356-9188
NSN 5905-01-113-6821
NSN 5905-00-699-8278
NSN 6645-01-654-9639
NSN 5999-00-231-7584
NSN 6645-01-351-6900