Active Aqua 55 Gallon Drum with Solid Lid and LockThis high quality 55 gallon drum is black in color and comes with a solid cover and bolt ring closure. It is perfect for use as a reservoir for larger hydroponic systems, even more so if the you drill the cover for tubing connections and or cut out a port for adding nutrients, testing pH, etc. Features 55 gallon nominal capacity 57 gallon actual capacity 2. 2 mm minimum wall thickness Weight: 25 3 4 lbs Height: 36 1 2" Top diameter: 23" Bottom