Atlantic Water Gardens Pond Filter & Waterfall Spillway, 20.5-inch Spillway Extra wide spillway enhances waterfall & aerates water. Open swirl chamber means water flows evenly & efficiently through filter pad & media Extra large container holds more bacteria for a cleaner pond Container is built of rugged high molecular weight polyethylene & warranted for life! Includes...media bags, removable bottom grate & filter pad Install Kit includes FIPT Bulkhead Fitting, Teflon Tape, Self-Tapping Stainless Screws, Silicone, Liner Attachment Flange & Instructions 1 1/2" bulkhead fitting