The AquaPro Aluminium Alloy CO₂ Check Valve Pro is a compact, inline one-way non-return valve built specifically for pressurised aquarium CO₂ systems. It prevents tank water from siphoning backwards down the airline when your CO₂ system shuts off or loses pressure, protecting expensive regulators and solenoid valves from water damage.

Key Specifications & Features:

• Material Construction: Machined from durable aluminium alloy (also available in a stainless steel variant), offering greater longevity and pressure resistance than standard plastic valves.
• System Compatibility: Designed exclusively for pressurised CO₂ setups and standard CO₂ tubing. It requires higher operating pressure to open and should not be used with standard low-pressure aquarium air pumps.
• Operation: Features a spring-loaded internal mechanism that allows one-way gas flow toward the tank while sealing shut against reverse water flow.
• Physical Profile: Compact inline cylinder measuring roughly 37 mm × 15 mm × 15 mm, weighing approximately 17 g.

Installation & Compatibility Notes:

• Flow Direction: Check the directional arrow engraved on the metal housing before installing. The arrow must point toward the aquarium diffuser.
• Tubing Fitment: Securely tighten the compression collars over rigid polyurethane (PU) CO₂ tubing rather than soft silicone airline tubing, which can slip off under pressure.