Description
Aqua Medic Silicone CO2 Hose – 4/6mm (5mtr Pack) — Soft 4/6 mm silicone tubing for CO2 and ozone lines, five metres per pack
Ordinary vinyl airline does not last long carrying ozone, and a stiffened, cracked line on an ozoniser or a CO2 system leaks exactly the gas it is meant to deliver. Aqua Medic Silicone CO2 Hose – 4/6mm (5mtr Pack) (SKU: AB71614) is Aqua Medic’s silicone tubing for CO2 and ozone, with a 4 mm internal and 6 mm external diameter, supplied as a single 5 m length. The 4/6 mm size is the common size for aquarium gas fittings, so it pushes onto regulator outlets, bubble counters, check valves, diffusers and reactor inlets made for it, as well as the 4/6 mm connections of ozonisers and air dryers such as the Aqua Medic Ozone Booster. Silicone stays soft and flexible, which makes it easy to route around a cabinet and to stretch over a fitting.
In a planted tank the hose carries CO2 from the regulator and needle valve through the bubble counter and non-return valve to a diffuser or reactor. On a reef it links the air dryer to the ozoniser and the ozoniser to the skimmer or reactor intake. Silicone allows a little CO2 to pass through its wall over long distances, so CO2 runs are best kept short; for ozone lines, silicone’s tolerance of the gas is the reason to choose it. A clean, square cut with a sharp blade gives an end that seals well on a fitting, and a non-return valve belongs in any line where water could siphon back towards a regulator or ozoniser. Five metres covers several short connections or one longer run from cabinet to tank.
Usage & Application
When to Use
- CO2 systems: Regulator to bubble counter, check valve and diffuser or reactor.
- Ozone lines: Air dryer to ozoniser, and ozoniser to skimmer or reactor.
- Replacing hardened tubing: Swapping out airline that has gone stiff or cracked.
- Tight cabinets: Soft tubing that bends neatly around equipment.
Installation & Replacement Guide
- Measure the run: Cut only what is needed; shorter CO2 runs lose less gas.
- Cut square: Use a sharp blade for a clean end that seals on the fitting.
- Push on fully: Seat each end over the whole length of the nipple or barb.
- Protect the gear: Fit a non-return valve where water could siphon back.
Product Specifications & Highlights
Key Features
- Silicone: Soft, flexible tubing suited to ozone.
- 4/6 mm: The standard size for aquarium gas fittings.
- Five metres: Enough for a full set of connections.
- Dual purpose: Sold by Aqua Medic for CO2 and ozone.
- Easy fitting: Stretches over nipples and barbs without heating.
Product Details
- Brand: Aqua Medic (Germany)
- SKU: AB71614
- Barcode (GTIN/EAN): 4025901135046
- Product Type: Aquascaping & CO2 > CO2 and Ozone Tubing
- Material: Silicone
- Internal Diameter: 4 mm
- External Diameter: 6 mm
- Length: 5 m
- Suitable For: CO2 and ozone lines
- Target Environment: Planted freshwater aquariums (CO2) and marine aquariums (ozone)


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