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 5895-00-300-3214
NSN 6620-01-305-6562
NSN 6130-00-982-5316
NSN 6145-01-653-1576
NSN 4140-00-862-5644
NSN 5835-00-811-4554
NSN 5985-00-450-4662
NSN 5945-00-682-0646
NSN 2925-01-524-6622
NSN 5985-01-599-1595
NSN 5905-00-726-3861
NSN 5985-01-311-5410