Automatic changeover regulators ensure first stage pressure reduction and a continuous gas supply to the installation. The changeover automatically switches to the reserve cylinder when the pressure falls in the supply cylinder. The indicator arrow turns red when the system has changed over and points to the empty cylinder. The indicator turns white when turned towards the new service cylinder. All our Automatic Changeover kits comprise of one regulator, two 20” pigtails, testpoint, emergency valve & plaque. UK Gas Safety Regulations state that in any domestic installation of over two cylinders an OPSO device is required, extra pigtails are included.