The Aquascape Hudson Water Fill Valve automatically adds water to your pond, waterfall, or fountain when needed. Adding a fill valve will help to reduce time spent filling your water feature and protects your pump from running dry in the case of water loss. The adjustable mounting plate allows for the water level to be adjusted after installation, making installation a snap. Slow addition of water also helps to contribute to a healthy ecosystem by preventing large chemistry swings associated with adding large amounts of water at once. The Hudson Water Fill Valve's ability to handle up to a 1.5 gallons per minute flow rate (8-65 PSI) allows the valve to be installed into a wide variety of water feature applications. The valve Includes fittings to connect to ¼“ poly pipe. The Hudson Water Fill Valve is also able to connect to ½” poly pipe or PVC pipe using additional fittings.