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 5915-00-908-9851
NSN 4140-00-241-0065
NSN 5905-01-383-5597
NSN 5975-01-500-8749
NSN 5920-01-464-2824
NSN 2925-00-712-8180
NSN 6645-00-445-3318
NSN 5999-00-237-7362
NSN 6220-00-171-8638
NSN 5965-01-391-1703
NSN 5950-00-179-2358
NSN 5998-01-307-8155