I bought a column with six Jet. In the shower I had a tap with transfer. Place the column and now I have the problem that to turn on the water heater I must open the tap of the current water and the tank. My question is if it can be for the installation of the column without removing the previous bobbin? .. I need you to explain to me how I should do to place it. It is necessary to remove the previous one or just put flexible in each connection and ready? Thank you.. '