Oreq 3000-18T Custom Cascade 3000 Series Waterfall, ABS Plastic. 18" Long with 12" Extended Lip. This model was designed for installation at heights up to 54" above pool water surface creating an unbroken cascading sheet of water. This waterfall will create a cascading sheet of water that looks satin in appearance. This waterfall box requires 20 GPM per liner foot of waterfall length. The box comes with 1.5" PVC Slip Inlet connection located on the back of the Waterfall box to connect plumbing line in. Check inlet spec chart for number of inlets and inlet location. We can get these in up to 8ft in length or more. We can take special order for radius or special shapes.