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 5855-01-426-5589
NSN 6220-01-337-9507
NSN 6645-01-202-7986
NSN 5905-00-139-2455
NSN 5996-00-886-1413
NSN 6150-01-659-2157
NSN 5990-00-519-8217
NSN 4140-01-044-6064
NSN 5950-01-050-8445
NSN 4140-01-604-1707
NSN 6135-00-500-2082
NSN 6685-01-353-6635