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 4140-01-649-3377
NSN 2925-01-248-2005
NSN 5910-01-040-3381
NSN 6685-00-507-3302
NSN 5990-01-492-6575
NSN 5930-01-617-5514
NSN 2925-00-928-5931
NSN 5975-00-351-8434
NSN 6320-01-583-6809
NSN 6620-01-109-2764
NSN 5920-01-468-7889
NSN 2925-00-435-2992