The new 50 Gallon Eazy Drain Reservoir uses a gradual interior slope to allow the solution to drain completely without manually tilting the unit. Designed to be used with a bulkhead fitting and on/off valve, the Eazy Drain makes maintaining your hydroponic systems hassle-free. The Eazy Drain also includes molded volume markers in gallons and liters so you'll always know how much solution you have left.