4mm Airline Non-Return Valve – Pond Air Pump Check Valve

Protect your pond air pump from water backflow with this 4mm Airline Non-Return Valve. Designed for use with pond and aquarium aeration systems, this simple yet essential fitting helps prevent water from siphoning back through the airline and damaging your air pump. The one-way valve allows air to flow towards your pond while preventing water from travelling in the opposite direction, offering additional protection for your aeration equipment. Key Features Prevents Water Backflow – Helps protect air pumps from water damage caused by siphoning. 4mm Airline Connection – Suitable for standard 4mm airline tubing. Easy Installation – Fits directly into your existing airline. One-Way Airflow – Allows air to pass towards your air stones while preventing reverse flow. Suitable for Ponds & Aquariums – Ideal for koi ponds, garden ponds, aquariums and small aeration systems. Affordable Pump Protection – A simple accessory that can help prevent costly equipment damage. Specifications Product Type: Airline Non-Return Valve / Check Valve Connection Size: 4mm Compatibility: 4mm airline tubing Application: Pond and aquarium air systems Quantity: 1 Valve Installation Advice Install the non-return valve inline between your air pump and air stone, ensuring the airflow direction indicated on the valve points towards the pond. For systems with multiple airlines, we recommend installing a separate non-return valve on each airline for maximum protection.