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 5895-00-019-2548
NSN 5998-01-508-1477
NSN 4140-01-175-0919
NSN 5925-00-219-2908
NSN 5855-00-256-5562
NSN 5920-00-781-9317
NSN 6135-01-627-3786
NSN 6240-01-361-9167
NSN 5855-01-531-9814
NSN 6650-01-467-8818
NSN 6105-00-436-1791
NSN 5975-00-528-9774