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 6105-00-955-2073
NSN 6620-01-359-0476
NSN 5960-00-170-6916
NSN 6650-00-140-8776
NSN 5915-01-106-0754
NSN 6685-01-595-3982
NSN 5960-01-453-6170
NSN 5990-01-411-5930
NSN 5935-01-212-2044
NSN 5915-01-332-1163
NSN 5920-00-192-6565
NSN 6130-01-515-8956