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This brass SpiroVent air separator/deaerator should always be installed at the hottest point within your system. In the case of a heating system, for example, this is the point where the water exits the boiler. In the case of a cooling system, it is in the return before the chiller unit.When fitted in the correct location this SpiroVent has the capability to deaerate your entire system as it can make the water absorptive.Features & Benefits: Spirotech SpiroVent Vertical Female Air Separator Brass - 3/4 inch, 110C, 10 Bar, Deaerates your entire system, To be installed at the hottest point within your heating or cooling system, Makes water absorptive. Spirotech SpiroVent Vertical Female Air Separator Brass - 3/4 inch UA075W