5/10Pcs Aquarium Check Valve, One-Way Non-Return Spring Valve for Fish Tank Air Pump, CO2 System, Airline Tubing Accessories(5Pcs)

5pcs/10Pcs Transparent Fish Aquarium Air Pump Check Valve One Way Non-Return Check Valve With Spring Aquarium Co2 System Air PumpFeatures:Clear check valve with spring.Functional design, practical one way check valve for aquarium air pump.Helps protect your air pump by reducing aquarium water from back siphoning during a power outage.Place in your airline tubing between your air pump and aquarium water to reduce water returning down the air line.Made of sturdy plastic, small and compact, easy to install.Compatible with standard aquarium air pipe of 4mm inner diameter.Specifications:Material: Plastic+springDimension: Approx.38mm x 11mm x4mm (Length*Diameter*Tube diameter)Color:transparentQuantity: 5pcs/10Pcs==========Battery Included : NoHigh-concerned chemical : NoneVoltage : NoneMaterial : PlasticModel Number : non return valveTube Calibre : 4mmType : fishPower (W) : NoneModel number : Aquarium Check ValveQuantity : 5pcs,10pcs

• Built‑in spring design supports reliable one‑way flow control for aquarium air pumps and CO2 systems, helping maintain consistent air delivery in aquatic setups.
• Non‑return structure helps reduce backward water flow in airline tubing, supporting consistent function of connected equipment during daily aquarium use.
• Fits standard aquarium airline tubing for simple inline installation, compatible with most freshwater and saltwater fish tank environments.
• Works with air stones, bubble walls, CO2 diffusers and other common aquarium accessories to support stable tank aeration and circulation.
• Sufficient 5/10 pack quantity supports ongoing use and replacement needs, ideal for multi‑tank setups and regular aquarium maintenance.