Yosoo 2 / 3 / 4 / 5 / 6 Way Splitter for CO2 Regulator, Needle Check Valve, Cylinder Brass constructions for long-lasting durability and dependability With this splitter, you can connect up to three CO2 diffusers/supplies from a single CO2 cylinder Each outlet is equipped with an individual needle valve allowing precise regulation of CO2 flow Easy setup, no modification required to your CO2 regulator NOTE: Bubble counter is NOT included.