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This SpiroTop auto-close air vent is fully automatic, as installation fluid functions best when it contains as little air as possible. This SpiroTop removes the air that gathers in an installation at the highest points, which can disrupt the flow or even stop it completely, working in a fast and effective manner, without the need for maintenance.Features & Benefits: Spirotech SpiroTop Automatic Air Vent - 1/2 inch, Fully automatic air vent, , Brass, Auto closing, Removes air that gathers at the highest point of an installation, Stops disruption of flow, Fast and effective, No maintenance needs, 180C, 10 Bar. Spirotech SpiroTop Automatic Air Vent - 1/2 inch SV5-FBA-05