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 5855-00-446-5921
NSN 5990-01-123-6557
NSN 5910-01-271-9599
NSN 5895-01-044-7750
NSN 5895-00-539-8322
NSN 5935-01-237-2498
NSN 6620-01-483-1138
NSN 5990-01-094-7740
NSN 5998-01-504-4830
NSN 6240-01-423-9738
NSN 5945-01-473-3447
NSN 6685-01-632-8809