SING F LTD 20PC Check Valves – 4mm Aquarium Air Pump Accessories

The SING F LTD 20-piece set of one-way non-return check valves is designed to protect your aquarium air pump from water backflow during power outages. Each valve features a 4mm air hole diameter, ensuring a secure fit for standard air pump tubing while preventing siphoning that could damage your equipment. The durable plastic construction resists ageing and corrosion, making these valves both long-lasting and easy to clean—simply unscrew, rinse, and reattach as needed.

Ideal for universal air pump setups, these valves are compatible with fish tanks, aquariums, and fishing tackle shops. The compact design (5.3cm long, 1.35cm high) allows for easy installation without bulk, while the detachable construction adds convenience for maintenance. With 20 valves included, this pack provides ample stock for daily use or replacements, ensuring your air pump system remains reliable year-round.

Made from high-quality plastic, these valves are lightweight (70g per pack) and packaged in a compact 17.6 x 11.5 x 1.9cm box, making them easy to store. Whether you’re setting up a new aquarium or maintaining an existing one, these check valves offer a simple yet effective solution to safeguard your air pump investment.