One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL 10pcs

One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm

10pcs
$14.48 $17.21
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One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL 10pcs
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL 10pcs
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL 10pcs
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
  • One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm Aquarium Check Valve QXL
One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm

One-Way Non-Return Check Valve for Aquarium Air Pump – 4mm

$14.48 $17.21
Color

One-Way Non-Return Check Valve for Aquarium Air Pumps

Keep your aquarium air pump safe and your tank running smoothly with these compact, durable one-way non-return check valves. Designed for standard 4mm inner diameter aquarium air tubing, these valves prevent back-siphoning during power outages — stopping tank water from flowing backward into your air pump and causing damage.

Why You'll Love These Check Valves

  • Protects Your Air Pump: The one-way valve mechanism blocks reverse water flow, keeping your pump safe during unexpected power cuts.
  • Universal Compatibility: Fits standard aquarium air line tubing with a 4mm inner diameter — suitable for most fish tanks, CO2 systems, and water line setups.
  • Compact & Lightweight: Measures approximately 5.3 cm (2.1 inches) in length, making it easy to fit into tight spaces inside your tank cabinet or hood.
  • Durable Plastic Construction: Made from sturdy, water-resistant plastic built to withstand continuous aquarium use without warping or cracking.
  • Quick & Easy Installation: Simply insert into your air line tubing — no tools required. The red colour also makes it easy to spot in your setup.
  • Multi-Pack Options: Available in packs of 1, 3, 5, or 10 so you can equip every tank in your collection or keep spares on hand.

Specifications

  • Material: Durable plastic
  • Colour: Red
  • Full Length: Approx. 5.3 cm (2.1 inches)
  • Inner Diameter Compatibility: 4mm standard aquarium air line tubing
  • Application: Aquarium air pumps, CO2 systems, water air lines
  • Made in Mainland China

Package Includes

  • 1 / 3 / 5 / 10 x One-Way Non-Return Check Valve (select your pack size above)

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Frequently Asked Questions

Q: What tube size do these aquarium check valves fit?

A: These one-way non-return check valves are compatible with standard aquarium air line tubing with a 4mm inner diameter, which is the most common size used in fish tank air pump setups.

Q: Do these check valves work with CO2 systems as well as air pumps?

A: Yes! These valves are suitable for use with aquarium air pumps, CO2 water line systems, and general air line plumbing in fish tanks — anywhere you need to prevent reverse water flow.

Q: How many valves do I get in a pack?

A: You can choose from packs of 1, 3, 5, or 10 check valves to suit your needs — whether you're setting up a single tank or outfitting multiple aquariums at once.

Q: Are these check valves easy to install?

A: Absolutely. Installation is straightforward — simply push each end of the valve into your air line tubing. No tools or special fittings are needed. The directional design ensures flow goes the correct way.

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