This $7 fitting really can improve the efficiency of your Rec Warehouse filter system. The 90 degree soft plastic elbow will improve the circulation in your above ground pool. The dirt on the surface of the water will move into the thru -wall skimmer before it becomes “water logged” and sinks to the bottom of the pool. No more energy cost, but huge improvement in circulation. The part fits into almost all standard return fittings. Part  # 400-1410fb      at www.waterwayparts.com