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 5985-01-464-5302
NSN 5960-00-275-7497
NSN 7035-00-408-8170
NSN 5930-01-143-7669
NSN 5915-01-413-2934
NSN 6110-01-250-2936
NSN 5910-01-040-6721
NSN 6620-00-510-9096
NSN 4140-01-521-4316
NSN 5920-01-476-8112
NSN 5910-01-051-2282
NSN 6135-01-071-4923