Connecting your water supply to the water system depends on how you choose to do so. Because the float valve is designed to 'creep fill' and to allow only 1-2" of water level drop before it opens, we recommend that you provide a method for filling the tank the first time using your existing line size and full line pressure. With the 1/2" pvc slip elbow you can literally connect any of several different fittings to make the final connection to your water supply.
We believe that using a garden hose connector works very well as it provides flexibility and is not a permanent connector. When you have finished filling the tank, install the float valve into the tank, and then connect the garden hose fitting from your water line to the connector from the float valve. Now turn on your water supply and the system is ready to give you days of continuous quality water for your animals.