Check the listing for details. TNB Naturals Enhancer CO2 Refill Pack of 2. Condition: New. Listed at 36.65 USD. TNB Naturals Enhancer CO2 Refill Pack of 2 TNB Enhancer CO2 Refill Pack The easiest way to create CO2 for your grow room just got easier with the TNB Enhancer CO2 Refill Pack! The TNB Enhancer CO2 Refill Pack gives growers the ability to reuse their existing Enhancer bottle while saving money and reducing their environmental footprint. All you have to do is empty your original TNB Enhancer bottle, rinse it out, and refill it with the TNB Enhancer CO2 Refill Pack! One Enhancer CO2 refill pack gives you instant CO2 for another 2+ weeks! Its the safest and easiest way to add CO2 to your grow room! The TNB Enhancer eliminates the use of propane burners and regulating equipment making it quick and easy to deliver adequate amounts of CO2 to your plants. Adding proper amounts of CO2 to your grow room can have amazing effects on your plant such as doubling your yields and production on all plants. TNB Naturals has created a CO2 dispersal product that continually outperforms any and all of its competitors time and time again in every study and experiment. Fast and Free Shipping You're already purchasing the item. Why pay additional for shipping, especially slow shipping? We get your order shipped out within 1-business day and delivered to your doorstep as quickly as possible. Competitive Pricing With our dynamic pricing model, our prices are always competitive. Our prices are some of the lowest that you will find on the internet. Rest assured that you're getting a good deal when purchasing with us. 30-day Money Back Guarantee We are committed to making sure that you leave this transaction satisfied. If you're unhappy with the product for any reason, you may return it back for your money-back or a replacement within 30 days. No questions asked!