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 6610-00-670-2396
NSN 5990-01-400-3299
NSN 5960-01-090-4205
NSN 5950-00-113-9268
NSN 6650-00-216-6365
NSN 6220-00-871-6154
NSN 5905-00-318-6869
NSN 5945-01-608-6877
NSN 5930-01-255-1993
NSN 5910-00-432-0715
NSN 6220-00-868-5651
NSN 5855-01-357-7907