... shaft sizes:12mm, 16mm,20mm, 5/8'' or3/4'' 2, for high temperature rubber 3, ISO9001 WenZhou RiMi Seal Manufacture Co ... developed 20 series and 500 sizes of mechanical seals. Which used in family water pumps, industrial pumps, auto cooling-pumps and ... low pressure, small diameter rotary shaft applications. Auto unitized seal for engine coolant pumps type 6A