A circular shaped item with an aperture manufactured to predetermined dimensions, constructed with a rectangular cross section that may be solid, with joint, or in a helical form that facilitates spiral wrap installation. It prevents seal extrusion under pressure and is designed to fit on the down-pressure side of a gland groove with a packing, preformed or o-ring.
NSN 7035-01-412-8322
NSN 6620-00-533-0536
NSN 5920-01-073-3334
NSN 6150-00-805-7982
NSN 5925-00-485-9175
NSN 5999-00-236-8995
NSN 5920-01-628-6876
NSN 6240-01-095-9510
NSN 5998-00-240-4971
NSN 6650-00-997-4337
NSN 5950-00-960-6193
NSN 6240-01-352-3642