Custom XL & XXL Automatic Pool Fillers for In-Ground PoolsCustom XL & XXL Automatic Pool Fillers for In Ground Pools Designed for pools with a larger drop from the coping to the water level, our Custom XL and XXL My Pool Filler models provide the same reliable automatic water level control as our Standard Model, but are built specifically for pools that require additional reach. These custom automatic pool fillers are ideal for vinyl liner pools, fiberglass pools, and custom in ground pools where the water