Unscrew the Tank Connector so that you have three separate parts ready to fit:
Part A - A 2" (5cm) long screwed fitting which should be fitted through the side or base of the tank, after drilling an 11mm hole (you will need access to the inside of the tank in order to fit this).
Part B - A rubber washer to fit onto the outside of the tank. Part C - A screw fitting lock nut to attach back onto the Tank Connector, on the outside of the tank, screw tight up to the washer for a secure, watertight connection.
You are then ready to fit the Ľ" tubing to the barbed fitting at the end of the Tank Connector.