Step one, insert wheels.
Step two, position medium size o-ring.
Step three, insert container into base and align the holes.
Step four, place one small o-ring onto the water valve and insert into the container.
Step five, inside container place the other small o-ring on the valve stem, followed by the flat washer then screw on the end connect hand tight- no tools please.
Step six, turn the water valve to the off position, put in the yellow drain plug and then fill the Critter Cooler.
Step seven, screw on the lid clockwise . Please note, it is VERY important to screw on the lid properly. Watch this short video on a simple trick that will help you screw on the lid correctly and how to change the large lid o-ring when needed. Watch it please. Editors Note: This video was made using the original Critter Cooler water valve. Critter Coolers now come standard with the new Heavy Duty water valve.