... reputation 2010, 2012 series mechanical seal (double seal, shaft seal) 2010, 2012 series middle pressure mechanical seal (double seal, shaft seal)Type 2010 is suitable ... jacket is needed, the total heigh will be 100mm higher.Type 2012 is also suitable for weak corrosive gas medium. Working ... . Under temperature 100, Cooling jacket is not needed. 2010, 2012 series middle pressure mechanical seal