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 5985-01-076-4710
NSN 6645-01-317-6071
NSN 2925-01-076-6128
NSN 6150-01-285-9860
NSN 6645-00-253-9617
NSN 6610-01-571-8038
NSN 6130-00-988-3257
NSN 6105-00-265-7545
NSN 5960-00-104-2740
NSN 6130-00-093-5863
NSN 6620-01-359-9916
NSN 6610-01-265-0999