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 5855-00-494-9581
NSN 6105-01-061-4001
NSN 4140-00-762-8989
NSN 5920-00-384-8926
NSN 5945-01-090-0610
NSN 6320-01-086-2602
NSN 6105-00-103-9906
NSN 6150-01-598-3889
NSN 6240-01-029-3316
NSN 6645-00-376-4829
NSN 5975-00-021-0707
NSN 5855-01-455-1491