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 6645-01-585-6866
NSN 5960-01-072-7118
NSN 5960-01-311-5817
NSN 5960-01-385-4333
NSN 5975-01-070-0522
NSN 5960-00-007-0872
NSN 5895-00-153-2595
NSN 6645-01-573-2536
NSN 5935-01-481-7477
NSN 5920-00-168-1402
NSN 2925-01-547-4565
NSN 6320-01-180-9908