【Air pump accessories】 Security valve of the non-return air pump, an essential accessory of the pump. Complete standard aquarium accessories for most air pump brands. 【Connect with a 4mm pipe】 10pcs air pump valves, which let a good amount of air and Prevent water from the aquarium from filling up again, compatible with 4 mm inner diameter standard aquarium pipes 【A function】 Protect the oxygenation pump from the damage caused by Retrograde water in the pump. An anti-return valve is placed in the tubing of your air line between your air pump and water from the aquarium to prevent water from returning to the air line. 【Application】 This control value can be used to prevent the reflux of water from damaging the front air pumps or other product equipment. Perfect for aquarium, fishing shop, etc. How to install: 1. Clean and dry both sides of the pipe before use to secure the valve firmly. 2. Check the flow direction of the valve to make sure it is installed on the right side. 3.
