The purpose of a header tank is to allow for the steering gear fluid to expand and contract due to temperature variations.
     The header tank can be used on a manual-filled system, as well as on an auto-filled system. The capacity of the tank is one quart (one liter). It is available with or without sight glass and breather.
     It is recommended to have this tank installed above the highest helm pump onboard ship. In addition, a manual-filled system should be installed with a breather, or an auto-filled system should be sealed with a vent line going from the header to the main tank.
     The KOBELT expansion tank is die cast from bronze.