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 6685-00-988-5222
NSN 5935-00-157-8168
NSN 6620-01-060-6418
NSN 6130-01-371-4571
NSN 5925-01-435-4943
NSN 5930-01-283-2782
NSN 4140-00-010-2986
NSN 5975-01-256-7216
NSN 5895-01-186-8816
NSN 6320-01-544-6447
NSN 5915-00-932-3040
NSN 6620-00-920-1671