Extend the swimming season in your above ground pool. Solar heater from SunQuest measures 2' x 12'. Connects to 1-1/2 inch or 1-1/4 inch hoses. Diverter Valve should be used with solar heater so water doesn't flow through the heater at night (which would result in a cooling of the pool water). Switch the valve setting when the sun is up to divert the water through the solar heater.