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 5910-01-539-1959
NSN 5996-01-407-3777
NSN 6620-01-168-8450
NSN 4140-01-423-1647
NSN 5975-01-186-2224
NSN 5920-01-030-7311
NSN 6145-01-030-7064
NSN 5985-01-465-5327
NSN 5915-00-948-1415
NSN 5930-01-281-1408
NSN 5975-01-468-9570
NSN 6685-01-609-7565