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 5998-01-331-4118
NSN 6320-01-170-4068
NSN 5855-01-257-5338
NSN 7035-00-523-7492
NSN 4140-01-150-0740
NSN 6645-01-304-4308
NSN 5985-01-131-0635
NSN 5990-01-143-2518
NSN 4140-01-371-1565
NSN 5905-00-225-8823
NSN 4140-01-131-6608
NSN 6130-00-113-4558