Enjoy fresh sparkling water whenever you want with the Gas4U 425g Screw-In CO₂ Cylinder. It twists straight into most screw-in sparkling water makers and makes up to 60 litres of sparkling water, replacing over 120 single-use plastic bottles.

As our own Gas4U cylinder, it gives you the same food-grade CO₂ as branded refills for less. Add fast delivery across Ireland and easy empty returns, and you'll never be caught without fizz.

Why Choose the Gas4U Screw-In 425g CO₂ Cylinder?

Fits Most Screw-In Machines The Gas4U Screw-In cylinder suits a wide range of sparkling water makers that use the traditional screw-in connection. It fits straight in, with no adapters needed.

Makes Up to 60 Litres of Sparkling Water Each 425g cylinder carbonates up to 60 litres of water, roughly:

• 60 x 1-litre bottles
• 120 x 500ml bottles

How far it goes depends on your fizz level. Lightly sparkling water stretches a cylinder further; extra fizz uses more CO₂.

Better Value Than Branded Refills You get the same 425g of food-grade CO₂ at a lower price than branded cylinders. Subscribe and save up to 50%, with free shipping included.

A Healthy Way to Stay Hydrated Plain sparkling water has zero calories, no artificial sweeteners and no preservatives. Enjoy it straight or add your favourite flavour.

Less Plastic, Fewer Shopping Trips Every cylinder replaces over 120 single-use plastic bottles. No more hauling heavy multipacks home from the supermarket.

Delivered to Your Door Anywhere in Ireland We deliver fresh cylinders nationwide, so your machine is always ready to go.

Easy Cylinder Returns One-time customers can return all their empties in one go with a free return label and get credit towards their next order. Subscribers get a reminder before each renewal and we collect the empties for you.

FAQs

Which machines does this cylinder fit? It fits sparkling water makers with a traditional screw-in CO₂ connection. It does not fit Quick Connect machines such as the SodaStream TERRA, ART or DUO. If you're unsure, use the Gas4U Compatibility Checker before ordering.

How do I fit a screw-in cylinder? Remove the cap, insert the cylinder into your machine and screw it in clockwise until hand-tight. Don't use tools or overtighten.

How much sparkling water does one cylinder make? Up to 60 litres, depending on how fizzy you like your water.

Is the CO₂ food grade? Yes. Every Gas4U cylinder is filled with food-grade carbon dioxide, suitable for drinking water and homemade sparkling drinks.

How is this different from a SodaStream Screw-In cylinder? Both hold 425g of food-grade CO₂ and make up to 60 litres. The Gas4U cylinder is our own brand and costs less.

How long will one cylinder last? If you drink about one litre of sparkling water a day, expect six to eight weeks, depending on your fizz level.

What do I do with my empty cylinder? Return it through the Gas4U returns process. One-time buyers receive credit towards their next order. Subscribers schedule a collection within 15 days of renewal.

Can I keep a spare? Yes. Many customers keep a second cylinder so they can swap straight away when one runs out.