To use the pressure reducer it is necessary to purchase the 1 / 4-7 / 16 fitting with VNR for reducer. pressure 2 manometersWe also recommend the purchase of the John Guest fitting Straight terminal (FLL) 5/16 (JG) x 1/4 (F) to connect the 8mm CO2 hoseTo buy only the gearbox:1) deactivate the other products (click the dash - at the top right of the...