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 5998-01-442-7841
NSN 5835-00-936-8753
NSN 5996-01-240-7085
NSN 6650-01-292-2119
NSN 6645-00-442-7128
NSN 5990-00-602-9750
NSN 6150-01-327-0185
NSN 6135-00-334-4500
NSN 5930-01-420-6372
NSN 6610-01-228-8883
NSN 6320-01-206-8930
NSN 5855-01-519-2486