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 2925-01-420-2362
NSN 6320-01-422-1212
NSN 6110-00-804-4830
NSN 6135-01-098-3020
NSN 4140-00-388-6829
NSN 6110-01-322-1324
NSN 5945-00-957-2016
NSN 5910-00-299-7869
NSN 5915-01-235-1245
NSN 6610-01-586-4255
NSN 5935-01-032-9886
NSN 6145-01-130-0673