Botanicare? CT Trays are customizable grow trays made from ABS plastic. The sidewalls on these versatile hydroponic grow trays are 2.5 inches high, an ideal height for environments with drip irrigation. Because we know no two grows are alike, these trays come in a wide range of lengths so you can customize your system for your setup. Choose between 4-foot (1,200 mm) and 5-foot (1,500 mm) widths, and combine a Drain and End Tray to create an 8-foot-long span. Or add 4-foot and 8-foot Middle Trays to create sections 12, 16, 20, or 24 feet long and beyond, to equip your greenhouse or indoor growing space with a fit that?s as efficient as it gets. Bond Three White Sealant yields 16.75 feet of seams (4-foot: 3.8 seams, 5-foot: 3.1 seams).