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 5998-01-390-2034
NSN 5935-00-741-1747
NSN 5895-00-543-2906
NSN 4140-00-679-9512
NSN 5960-01-316-6563
NSN 5965-00-092-8841
NSN 4140-01-316-0493
NSN 6130-01-384-0315
NSN 5985-01-046-1780
NSN 7035-01-631-9354
NSN 5905-01-423-9339
NSN 6145-01-020-1095