Mufan CO2 Solenoid Regulator is a superior quality CO2 Regulator designed specifically to use with CO2 diffusers. It is an excellent regulator for the beginner enthusiast or the planted tank professionals seeking a sleek, compact, superior quality regulator. Made with Duralumin, the Mufan CO2 regulator solenoid outclasses its competitors through its excellent durability and its precision control of gas flow with parts from China. Designed with simplicity, the Mufan CO2 regulator solenoid allows users to hand tighten the regulator to the CO2 cylinder or by using Wrenches. comes with a bubble counter.