The 3-way valve is metal and separates the air flow into the gravel filter and air stone. Increase or decrease airflow for everyone with easily adjustable knobs. The hose fits snugly with no air leaks. Check valves must be installed in the correct direction, with the pointed part of the valve pointing toward the pump to allow air to flow. So far there is no backflow to the pump. Everything works perfectly and is easy to assemble.
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