CO2 pressure regulator with a high performance pressure gauge MM05-00162-SG (for refillable standard cylinders) The new MM05-00162 series CO2 pressure regulator with a manometer has been specially designed for aquariums. The choice of the best materials (metal alloys and steel), which are produced in Asian factories in numerous quantities, allows us to offer the best value for money. The regulator is supplied complete with 1 high pressure gauge for reading the remaining charge in the cylinder, includes removable bubble counter with built-in check valve and thanks to the control knob closing/opening with fine adjustment and safety valve with vent hole, you can adjust the amount of CO2 to be dispensed at will.