2. Drill two 25mm holes, one near the top for an inlet and another near the bottom for a tap.
3. Buy the Maze water tank downpipe diverter set ($15).
This set comes with inlet connection fittings that is inserted from inside the water tank/drum. (As my water drum was sealed, I used a coat hanger to insert the inlet connection fitting inside the tank - see pictures below).
4. Fit a tap at the lower hole. (A plastic tap costs $5). Remember to apply threadseal tape and sealant to prevent leaks.
5. Using a hacksaw, cut a 30mm gap in your downpipe at the correct height, as per the Maze product's instructions.
6. Place the diverter in the gap of the downpipe.
7. Connect the hose that was included in the Maze water diverter set and "Voila !"