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 4140-01-027-1871
NSN 5855-01-440-9209
NSN 5990-01-089-6743
NSN 6130-01-523-5060
NSN 2925-01-510-9378
NSN 5960-00-572-7434
NSN 5996-01-098-6712
NSN 5930-00-955-2304
NSN 2925-01-089-6269
NSN 2925-01-650-3412
NSN 6320-01-425-1417
NSN 7035-00-897-7567