1,sleeve assembly: match three common shaft sizes:12mm, 16mm,20mm, 5/8'' or3/4'' 2, for high temperature rubber 3, ISO9001 WenZhou ... finished products, mould designing,lathing,stamping,molding,grinding and final assembly are all accomplished in ourselves specialized facility. We exactly follow ... low pressure, small diameter rotary shaft applications. Auto unitized seal for engine coolant pumps type 6A