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 5935-01-657-0653
NSN 5950-00-411-8825
NSN 6620-01-200-6493
NSN 5985-01-549-1228
NSN 5910-00-362-6687
NSN 7035-01-213-5590
NSN 5998-01-622-1555
NSN 6130-00-702-8865
NSN 6320-01-056-1164
NSN 6135-00-209-6918
NSN 5935-01-032-4620
NSN 4140-01-166-0028