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 6610-00-060-0871
NSN 6645-01-053-3185
NSN 5945-01-481-0579
NSN 5935-00-997-1358
NSN 4140-01-331-5974
NSN 6645-01-025-1002
NSN 6105-01-090-5748
NSN 5915-01-183-3448
NSN 4140-00-211-5970
NSN 6610-00-180-9062
NSN 5965-00-256-8687
NSN 6105-00-881-5185