Hydro Flow Flood & Drain Kit - 3 ft x 3 ft & 4 ft x 4 ft This Hydro Flow Flood and Drain Kit are designed to simplify your irrigation set up on 3 ft x 3 ft and 4 ft x 4 ft flood trays From reservoir to plant, this kit provides all the irrigation components required to set up your flood and drain tray Trays sold separately