Baoshishan Aquarium Co2 System 2L, Upgraded External Threaded Co2 System Product Features Thread Variation for Hassle Free Use -- Our aquarium co2 system upgrades from internal thread to external thread to fit more raw materials without residue. At the same time, the sealing is enhanced to prevent gas from escaping danger and blocking, ensuring smooth operation. So you can focus on your aquarium Enhanced Safety with Dual Switch Valve -- New main valve switch gives you full control of the CO2 generator. Worried about gas leaks during reactions? Just close the main valve. In addition, an auto - pressure relief valve kicks in at 35KG. Double layer safety keeps your aquarium plants safe and gives you peace of mind Water Injectable Bubble Counter -- Our upgraded bubble counter lets you add water while aquarium co2 generator is running. No need to turn off the gas or remove the equipment. Paired with the fine tuning valve, adjust the size and exit speed of bubbles. Keep co2 levels stable for growing plants Durable Build -- Co2 generator for plants is made of 304 stainless steel, It's durable, stable, safe, and high pressure resistant. Can accommodate at once with a 200g capacity for both citric acid and baking soda, expect consistent CO2 for healthier, lusher plants Complete Co2 Aquarium Kit for Easy Setup -- We've got everything you need: cylinder, valve, 3-stage filter, bubble counter, solenoid valve, base, 2.7" stainless steel atomizer, check valve, 78.7" air tube, silicone funnel, snap-on suction sucker, syringe, and spare sealing rings. Saves you the hassle of scouring multiple stores for individual component purchases Tips for All Users -- Suggest using rectangular tank within (23" L 12 "W 15" H)/231=17 gallon; Calculated at a rate of one bubble per second, if left open for 24 hours, the gas reflected at a time can be used for about 15 days (if left open for 8 hours per day, it can be used for 45 days at a time) Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!