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 5990-01-633-9503
NSN 6685-01-649-9799
NSN 6620-01-624-3933
NSN 6220-01-391-7552
NSN 6130-00-319-0796
NSN 5960-00-790-0509
NSN 6110-00-518-2998
NSN 5895-01-451-3535
NSN 7035-01-392-5274
NSN 5960-00-140-4448
NSN 5985-01-190-0773
NSN 6650-00-191-9000