SmartPool Universal Swimming Pool Solar Heating System - 4 x 20 Feet NOTE: 4 x 20 foot panel comes as two 2 x 20 foot panels Universal solar panels can be used on in ground or above ground pools Universal Solar Heating Systems may raise pool temperature 6-10 degrees Direct Flow System with patented Web Design tube construction optimizes heat transfer from the sun to your pool Includes: Solar panels, end caps, pipe adapters, mounting kit, diverter valve kit and installation manual