Recommended solution for the 34 and 110 litre canisters.
It allows the user to achieve a fixed flow of gas (0.5litres / minute) and features the added benefit of a pressure gauge indicating the contents of the canister.

Chemistry School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Fixed Flow Regulator Lab Equipments used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Chemistry Lab Equipment for Engineering Teaching Lab in Universities