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 5920-01-068-3135
NSN 5965-01-005-6617
NSN 5930-01-274-7018
NSN 5945-01-376-9239
NSN 5975-01-138-4306
NSN 6145-00-851-7725
NSN 6135-00-284-1406
NSN 5975-01-566-0226
NSN 4140-01-084-9429
NSN 5985-01-417-6540
NSN 5999-01-555-8736
NSN 6620-00-186-8220