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 6650-00-144-4555
NSN 5975-00-196-0698
NSN 5950-00-611-0516
NSN 6650-00-518-2962
NSN 6610-01-091-3740
NSN 6620-01-218-3542
NSN 5985-00-630-0457
NSN 6320-01-443-8676
NSN 5999-01-369-3145
NSN 4140-01-012-2460
NSN 5990-00-345-8967
NSN 6685-01-513-6928