Frigoboat Keel Cooler fitting Thread Mount. Similar to a regular thru-hull fitting, where the throat passes through the hull, and a nut is threaded onto the shaft and tightened. The keel-cooler must be mounted within 5′ of the compressor. A Frigoboat keel-cooler acts as the condenser for the system. The R134a refrigerant is circulated by the compressor, down through tubing inbedded in the sintered bronze mounted on your hull. This is where the heat exchange takes place, removing the heat completely from the refrigerant and not into vessel. No pump! No fan! No noise! Choose either the model with zincs (E50361Z) or, if you can connect the keel cooler into your bonding system, choose the model without zincs (50361).
