MasterCool® MCP44-PPK Purge Pump KitMasterCool Purge Pump Kit periodically expels water from the reservoir to prevent mineral build up. Purge pump actually use less water compared to bleed off systems, keeps media pads clean adding to their life span, saves on maintenance. Pump kit includes pump, pump bracket, hose kit, screw to mount bracket. Periodically expels water from the reservoir to prevent mineral build up Purge pump actually use less water compared to bleed off systems Keeps