The new Flo-n-Gro? Bottom Drain Bucket allows for total drainage of your hydro system. It also features a built-in bulkhead that allows you to screw your Hydro Flow? brand 1/2 and 3/4 in fittings directly into it for easy installation. The bucket works with the 3 gallon Flo-n-Gro? Mesh Inserts that is sold separately.