2x PRO2 22 Litre Refill Canisters (44 Litres)

Two refill canisters with push button caps.
Can be used with any attachment, simply remove the push button activator to use the inhaler cup.
 
What makes PRO2 special is that it contains an adsorbent which is specially designed to store a much larger volume of oxygen than could be otherwise stored using compression alone. For this reason the device contains and delivers up to three times the quantity of similar container volume products, offering by far and away the best value breathing oxygen on the market. 
 
Each PRO2 canister contains 22 litres of oxygen in a 650 ml canister.
(Dimensions: Diameter 65mm, Height 225mm)