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 5835-01-156-5622
NSN 5999-01-254-0283
NSN 5905-00-582-7031
NSN 6620-01-271-0711
NSN 4140-01-633-7709
NSN 5965-00-405-3793
NSN 6135-01-448-9474
NSN 2925-00-346-6968
NSN 6685-01-065-3511
NSN 6130-00-150-0323
NSN 6650-01-399-8552
NSN 2925-01-554-5246