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 6610-01-440-9913
NSN 5905-01-142-2894
NSN 5975-01-373-5517
NSN 5990-01-167-7043
NSN 5950-01-103-4230
NSN 5915-01-417-6609
NSN 7035-01-648-6860
NSN 2925-00-149-0760
NSN 4140-01-302-6824
NSN 5915-00-035-8590
NSN 5996-01-242-9710
NSN 6685-01-091-4225