WebArrives by Thu, Apr 27 Buy Refill Station Transfer Adaptor Hose for BS 341 No. 3 (UK) Argon Cylinder ,Helium or CO2 Transfill Adaptor,CGA580 at Walmart.com. Skip to Main Content. Departments. Services. Cancel. Reorder. My Items. Reorder Lists Registries. Sign In. Account. Sign In Create an account. WebStep 2：. Hydro testing and cleaning the inside of the cylinder. Step 2: Dry the fire extinguisher internally. Step 3: Put the fire extinguisher on the electronic scale and use the refilling machine to fill until the weight is reached and then stop. Step 4: Inject N2 gas to ensure the air pressure of the fire extinguisher.

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