This air valve handle is an OEM product from Aqua Exclusive™ which is designed for use in the air system of the Green Line Bio Filter. With this air valve handle you regulate the airflow for the membranes of the air diffusers. This item is sold individually, but you can also buy it together with the air valve.
If you have any questions about replacing a part, please contact our support team. They are 24/7 available to help you.