Jandy Trade Series 1318CBF 18" x 12" Lip Clear Super Radius Bottom Feed Sheer Descent® Cascade Waterfalll produces a clear arc of water that can be adjusted from a silent, glass-like sheet of water to a rushing mountain waterfall. A captivating addition to any new, remodeled, or existing pool or spa. The 12'' Super Radius extended lip waterfalls produce the same effect as the standard 1'' and 6'' lip Sheer Descent Waterfall, but allow For installation of brick or stone on the face of the raised beam. Super Radius Waterfalls are designed For use when extreme radius curves are required.