... three common shaft sizes:12mm, 16mm,20mm, 5/8'' or3/4'' 2, for high temperature rubber 3, ISO9001 WenZhou RiMi Seal Manufacture Co ... sealing products1,a convoluted elastomer bellows2, sleeve assmebly: match common shaft sizes: 12mm, 13mm, 15mm, 16mm ,17mm, 20mm, 1/2'', ... .5, high volume use in low pressure, small diameter rotary shaft applications. Auto unitized seal for engine coolant pumps type 6A