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 5925-01-134-2747
NSN 6620-01-369-5876
NSN 5925-01-508-7951
NSN 5960-01-544-1273
NSN 6220-01-307-8223
NSN 6645-01-244-4881
NSN 6110-01-056-4964
NSN 6105-01-481-5166
NSN 5925-00-824-0329
NSN 5835-01-101-7650
NSN 6145-00-821-2106
NSN 6685-00-383-5488