Fastfalls Spillway boxes diffuse incoming water flow to create the starting point of Pond-free streams and falls. Atlantic FastFalls are designed to make plumbing the top of the waterfall as easy as possible. Innovative rear liner attachment simplifies installation and eliminates leakage due to settling. Crush-proof design with internal baffles stabilized by support cones carries the weight of the largest rock and stone. Reinforced spillway lip retains rock, gravel, mulch or soil and can be planted to blend seamlessly into the surrounding landscape. FastFalls includes installation kit, male thread adapter and one-piece liner flange. The PS1900 has a 19" waterfall width and a max flow of 4,000 gph.