The CPR Aquatics Sump Inlet Assembly w/ Filter Sock hooks onto the side of a sump and filters out the largest sediment coming out of the tank into a filter sock. This filter sock pre-filter can be cleaned easily and frequently.Includes:Inlet HolderPVC AdapterPre-Filter BagFeatures:Inlet Holder Size: 8-1/2" L X 5" W X 2-1/2" HPre-Filter Inlet Diameter: 4"Pre-Filter Inlet Pipe Diameter: 1-1/4"