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 6685-01-530-7681
NSN 5985-00-595-8633
NSN 6620-01-510-3501
NSN 5965-01-528-6453
NSN 5960-01-116-2092
NSN 5965-01-453-7504
NSN 5999-01-100-7238
NSN 6610-01-640-8592
NSN 5855-01-342-3824
NSN 5960-01-599-9821
NSN 6145-00-534-1412
NSN 2925-01-327-3069