To use a 12V car tyre inflator, follow these steps: Remove and keep safe the tyre valve cap. Plug the inflator into your car’s cigarette lighter socket or use the battery if it’s cordless. Attach the hose and nozzle to your tyre valve and make sure it’s secure. Turn on the inflator and set the desired pressure on the gauge or preset function. Wait for the inflator to inflate your tyre and stop automatically when the pressure is reached. Detach the hose and nozzle from your tyre valve and replace the valve cap. Repeat the process for the other tyres if needed. Turn off and unplug the inflator and store it in a safe place.