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 6320-01-386-3491
NSN 5985-01-366-4276
NSN 6105-01-056-1729
NSN 5990-00-005-5215
NSN 5975-01-197-7673
NSN 6645-00-153-3834
NSN 5915-01-173-2904
NSN 5985-01-306-4622
NSN 5975-01-067-9134
NSN 6240-00-546-2244
NSN 2925-01-464-3093
NSN 5925-01-555-0702