Check the listing for details. SurePlunge CO2 Refill Cartridges (Qty 10) --- 10-Pack Box. Condition: New. Listed at 14.99 USD. SurePlunge brand CO2 Refill Cartridges (Qty 10) --- 10-Pack Box. Compatible with SurePlunge, Mr.Pung, Mr.Pung Mini, Kleer DrainWe are the ONLY authorized USA Distributor for SurePlungeTM automatic toilet plunger products. Please beware of resellers with very high shipping costs. CO2 Replacement Cartridges for SurePlunge Plunger.Quick, Safe, Easy and Very Cost Effective.Cartridges Deliver the Correct Level of Air Pressure.High Quality CO2 Dislodge Blockages and Clear Pipes.Single-use, recyclable steel cylinders These are authentic SurePlunge branded replacement, single-use chargers. Guaranteed to work with the SurePlunge Automatic Toilet Plunger!! Our chargers deliver the correct amount of compressed Co2 (8g) - an innocuous gas that is used in carbonated drinks - required for the proper operation of our co2 powered SurePlunge Toilet Plunger. Yes, these are the correct size chargers. Yes, they will deliver the proper level of pressure - enough to push the water forward and dislodge blockages. IF you happen to have any issues with either the SurePlunge itself or our co2 cylinders, please reach out to us immediately. No, there is no such thing as "duds" or "empty" cylinders... most likely these are bogus comments. We are here to help. Please reach out for any assistance.