Aquarium Co2 Cylinders

All Co2 Bottles/Cylinders we Supply are Rent Free

Co2 is held in its liquid form by the pressure of the gas.

When the gas is drawn off the liquid evaporates until an equilibrium is created at approximately 830psi. It is for this reason your Co2 regulator will not show the amount of gas left in the cylinder as the regulator will only show the pressure not the amount of liquid Co2 remaining in the cylinder.

Co2 cylinders contain liquid Co2 and are sold by weight, the sizes we stock are: Small 3kg of Co2 520mm high, 6.35 Kg. (14lb) about 830mm high X 150mm wide..

All cylinders must have a safety certificate which will be held by the person or company who had the cylinder tested, the plastic disc between the valve and cylinder body states the 'Retest (year) the month is usually numbers round the edge 1 to 12 with a mark or stamp on the relevant month. The test could be 5 or 10 years, no cylinder can be filled with out a current test

Out of date cylinders can be part exchanged against a new cylinder and cannot be filled

Please read these guides before purchasing or handling your pressurized cylinders

Safe Handling PDF     Cylinder Buying Guide

Contact & Collection Details

 Our eBay Store 


10ltr Co2 Cylinder 

Contains approx 6.35Kg liquid Co2

£45+£20 for Gas

Total £65.00

Yelow hexagon collar certified for use until 2021


4ltr Co2 Cylinder 

Contains approx 3.00Kg liquid Co2

£55.00 including Gas

Only 520mm high

Yellow hexagon collar certified

for use until 2021

Collection only from 


Purchasing Cylinders You can pay:

Cash on collection

Website: Press 'Buy Now' button 

eBay: see  Our eBay Store  'Buy Now' button 

Pressing the 'Buy Now' button transfers you to the secure website where you can pay securely using PayPal or your Credit/Debit Card NO information regarding any purchase is retained or processed on this site

Open 10:30am to 7:00pmCo2 Reef Tank & Fish Tank Co2 Cylinders 6.35kg of Co2

 £45.00 Plus £20.00 for Gas


Half Size 520mm High

3.00kg Co2 Cylinders 

£55.00 Including Co2 Gas


Q. How much gas is in 1 kilogram of liquid Co2?

A. 1 kg of liquid Co2 expands to about 

550 litres of Co2 gas at atmospheric pressure


Trade in your old cylinder for up to £30 Discount

off a new fully tested cylinder

Standard Co2 fittings means they can be filled anywhere

Just to make sure everybody knows this bottle is 'Rent Free' we've put it on the label

Co2 gas cylinder 830mm X 150mm full of liquid Carbon Dioxide for Mig Welding Home brew, planted aquariums, pipe freezing, Label ‘Rent Free’ Co2 gas cylinder 830mm X 150mm full of liquid Carbon Dioxide for Mig Welding Home brew, planted aquariums, pipe freezing, Label ‘Statutory Cylinder information’ Co2 gas cylinder 830mm X 150mm full of liquid Carbon Dioxide for Mig Welding Home brew, planted aquariums, pipe freezing, Label ‘Rent Free’

'Rent Free' The Label Says So

Gas Cylinder Safety Collars

Bottle Safety Coller

Yorkshire Co2 Gas Supplying Food Grade Co2 Gas

Co2 Cylinders now being refilled in Sheffield

See side panel

 Co2 Gas eBay Listings 

Good Sites

Good place for buying stuff

 Aquarist Mag 

Looks Good Co2 Supermarket 

Plenty of Information Fish Forever 

Good Forums

Good Forum Fishkeeping Forum 

 Plenty of Info Practical Fishkeepin 
Seems knowledgeable Co2 Forum 

Hassle Free Filling

Co2 cylinder label showing: ‘rent free’, purchased from Yorkshire Co2 gas. Carbon dioxide ‘E290’, Co2 ‘1013’, fire hazard ‘2’, emergency phone number

Co2 Cylinder Sizes

Pipe Freezing Cylinder

for Plumbers

22.5kg Co2 Cylinders

Professional Welders

20.0kg Co2 Cylinders

Professional Welders

Co2 Refills in Sheffield

Cylinder Refills

234 Holme Lane 

Sheffield S6 4JZ   

Open 9am Till 4pm

Mon To Friday

Sat 10am  Till 4pm

Not Open Sundays

Only legal 'in date'

cylinders will be filled.

If in doubt Phone First

0114 285 2477

Sheffield Co2 cylinder refills for paint balling, welders. Aquariums, home brew enthusiasts

Co2 Refills in Doncaster

Cylinder Refill/Exchange

Available 7 Days a Week

3.00kg £20.00

6.35kg £20.00

20.00kg £37.00

22.5kg £40,00

10:30am to 7:30pm

PLease phone first

01302 366332

Contact & Collection Details

 Our eBay Store