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 6620-01-131-9620
NSN 6110-01-388-1723
NSN 5996-01-605-7650
NSN 2925-00-142-9919
NSN 6220-01-646-0555
NSN 5998-01-352-3570
NSN 5975-01-492-6267
NSN 6610-00-923-1917
NSN 5925-01-192-1452
NSN 5990-01-072-6074
NSN 6110-01-206-6479
NSN 5965-00-605-8239