EasyPro CF34E Eco Series 34-Inch Waterfall Spillway Dual 2-inch inlets pre-installed allow for easy plumbing into either end 4-inch diffuser tube lays across bottom of spillway Liner attaches to spillway using the spliner lock system; No silicone, bolts or tools needed! Gravel can be used to fill the inside of the spillway creating a natural, even looking waterfall 34-inch waterfall spillway width - Recommended 6750 GPH / Max 9000