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 5990-01-514-8708
NSN 5855-00-821-7512
NSN 2925-00-520-9546
NSN 6150-00-350-8202
NSN 6105-00-231-4370
NSN 6645-00-133-1536
NSN 5975-01-512-2038
NSN 6220-01-532-1704
NSN 5975-01-449-1462
NSN 6645-00-239-2472
NSN 6145-01-265-8320
NSN 5965-00-757-3403