Resun Check Valve (2pc)

These non-return valves are essential aquarium accessories designed to prevent water from flowing back into the air pump, protecting it from damage. Typically made from durable plastic, they feature a one-way check valve mechanism that allows air to flow from the pump to aerators or air stones while blocking reverse water flow. Compatible with 4/6mm airline tubing, they are easy to install and ensure a consistent air supply for maintaining optimal oxygen levels in aquariums or ponds. Ideal for aquarists seeking reliable and efficient water management in their setups.