Some evaporative coolers use a water line connected directly to a hose bib. which sends water to the cooler without having to manually refill the pan inside the cooler. Connecting a water line to a cooler is an easy task that does not require special tools, although the water valve needs to have a threaded port for a 1/4 inch water supply tube. Either copper or plastic water lines work for a cooler; a copper line may last longer than plastic.
Turn the water off to the existing water valve before removing the valve to replace it with one that has a 1/4 inch port for the tubing.
Use a wrench to remove the existing water valve. Determine that the washer inside the new cooler water valve is in place and sits evenly inside the valve. Thread the cooler water valve onto the water pipe, tightening it firmly.
Unroll the water line to the cooler. You may want to bury the water line running to the cooler if the line lays in a part of the yard that receives heavy foot traffic or is in a grassy area that needs mowing. Since the water lines are lightweight and narrow, digging a shallow trench an inch or two deep is sufficient to bury the line, covering it with the original material in the yard.
Slip the tightening nut onto one end of the water line, followed by the compression sleeve. Bring the ends of the sleeve and nut to the end of the water line and thread the nut onto the water valve for coolers. Tighten the nut with the wrench gently. As you tighten the nut, the compression sleeve adapts to the shape of the hose, reducing water leaks.
Put the tightening nut and compression sleeve on the,end of the hose leading to the cooler's float valve assembly, typically located on one side of the cooler. Thread the nut onto the connection on the outside of the cooler. Tighten with the wrench.
Turn the water back on to the spigot and turn on the water at the water valve. Check for leaks at both ends of the cooler's water line. Tighten the nut if leaks are present. Once the cooler is full, the float shuts off the water automatically at the cooler.