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 5985-01-634-0635
NSN 5950-00-468-6019
NSN 6620-00-001-1398
NSN 6620-01-307-3468
NSN 5855-01-444-9182
NSN 6685-01-411-9188
NSN 5930-00-379-6731
NSN 6650-01-089-6192
NSN 6240-01-558-3424
NSN 5855-00-494-9581
NSN 6130-01-515-6078
NSN 6685-01-653-5477