Week Aqua Quick Plug CO2 Solenoid Valve

The Week Aqua Quick Plug CO2 Solenoid Valve automates CO2 injection for your planted aquarium. Wired through a timer, it opens to let CO2 flow while your lights are on and closes when they switch off. This prevents harmful night-time CO2 build-up, conserves cylinder gas, and keeps daytime levels stable for healthy plant growth. It uses a low-temperature DC design, so it stays cool to the touch and runs near-silently, and it ships with an NZ/AU wall adapter ready for local outlets.

Choose your configuration:

• Single Head. Designed to integrate with a regulator. One end connects to a standard CO2 regulator fitting (typically where a bubble counter attaches), and the other end takes standard 4/6 mm CO2 hose. This is the choice if you're mounting the solenoid onto your regulator or bubble-counter stack.
• Double Head. Quick-plug fittings on both ends for standard 4/6 mm CO2 tubing. This is the choice for a tool-free, hose-to-hose installation: drop it inline anywhere between your regulator and diffuser with no threaded adapters needed. Ideal for cabinet-mounted setups and more customised CO2 systems.

Both options are a single solenoid valve. The difference is purely the end fittings and how you want to plumb it into your system.

Key features:

• Timer-ready automation. Switches CO2 on with your lights and off at night, protecting fish and saving gas
• Low-temperature DC operation. Runs cool and quiet, safe for long daily cycles
• Two fitting configurations. Single head (regulator-mount) or double head (tool-free hose-to-hose)
• Quick-plug connectors. Push tubing in to lock, press the collar to release
• NZ/AU power adapter included. Plug-and-play for New Zealand and Australian mains
• Durable aluminium-alloy body. Compact enough to sit inside an aquarium cabinet
• Fits standard 4/6 mm CO2 tubing

What's in the box:

• 1 × Week Aqua Quick Plug CO2 Solenoid Valve (Single or Double Head, as selected)
• 1 × NZ/AU power adapter
• 1 × DC connector cable

Installation:

1. Decide your mount point. For single head, connect the regulator-side fitting onto your CO2 regulator or bubble counter. For double head, position it inline in your CO2 cabinet.
2. Connect your incoming CO2 line to the inlet and the outgoing line (to your diffuser or atomiser) to the outlet. A check valve between the solenoid and diffuser is recommended to prevent water back-siphoning into the valve.
3. Plug the valve into the supplied NZ/AU adapter, and the adapter into your aquarium timer.
4. Set the timer so CO2 comes on shortly before lights-on and off before lights-out, then dial in your bubble rate.

Specifications:

• Type: low-temperature DC CO2 solenoid valve
• Configurations: Single Head (regulator-mount) / Double Head (quick-plug both ends)
• Compatible tubing: 4/6 mm CO2 tubing
• Working pressure: not exceeding approx. 0.6 MPa (around 87 PSI).
• Power adapter: NZ/AU plug included; mains input AC 100 to 240V
• Single head dimensions: approx. 66 mm (H) × 31 mm (W)
• Double head dimensions: approx. 60 mm (H) × 31 mm (W)
• Body material: aluminium alloy