Add to Wishlist Samson 3733 18 Gallon Gravity Discharge Drain Samson 3733 18 Gallon Gravity Discharge Drain (18 Gallon) Gravity Collection with Remote Pump Discharge Mobile waste drains are used for gravity or suction collection of motor oil, gear oil, or non-aggressive fluids. Gravity drains feature a telescopic... MSRP: $829.60