It is well known that draft beer when tapped often gives more foam than wanted

There can be many reasons for that, but in most cases it is because the CO2 pressure in the beer keg is not correct according to the temperature of the beer in the keg. Some people adjust the CO2 pressure either up or down when the temperature fluctuates, but people do not always remember to do this. That is how the problems start with either over carbonated beer foaming too much or under carbonated flat beer. The solution is a DraftMore which automatically adjusts the right CO2 pressure in the beer keg depending on the temperature.