The bubble counter is a simple and safe unit for monitoring the dosage of CO2 gas into aquaria and filter components. Therefore, it is crucial to maintain the correct CO2 levels. Excess Co2 levels will lead to a sudden drop in pH level &amp; cause severe stress to your fish. On the contrary, deficient Co2 will affect the growth of your plants and fish. And the integrated non-return valve is used to keep the flow of liquid moving in one direction and not to back flow up the pipe and the holding plate lets you install the bubble counter in an easily viewable area.<!--Features --><p>FEATURES</p><UL class=p_f><LI>New and high quality</LI><LI>Easy setup and use</LI><LI>Use this counter with CO2 regulator, it can count the quantity of CO2, and supply the plants enough CO2</LI><LI>Designed for screw lock on the CO2 tube, dont worry the tube loose off by the pressure or caused damage</LI><LI>Double check valve patent designed, keep the regulator and CO2 bottle form damage</LI><LI>For easy maintenance, adopt the design of replacement of accessories</LI></UL><!--Specifications --><p>Specifications</p><UL><LI>Dimensions: 4.06 x 0.79" / 10.3 x 2 cm (H x Dia)</LI><LI>Weight: 0.99 oz / 28 g</LI><LI>Material: PC</LI></UL><!--Package Includes --><p>Package Includes</p><UL><LI>1 x D-498 Aquarium CO2 Bubble Counter With Double Check Valve</LI></UL><!--Extra Info --><!--produts_compatibility -->