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 5895-00-557-6255
NSN 6130-01-132-8052
NSN 5975-01-177-5688
NSN 5930-00-905-6459
NSN 4140-01-283-6699
NSN 2925-01-484-8556
NSN 6220-01-113-7501
NSN 5950-00-314-8268
NSN 6320-00-242-3300
NSN 5855-00-256-5562
NSN 6620-00-758-5233
NSN 5945-00-246-5740