Self-contained unit connects to a Leak Diverter (sold separately) or other liquid sources to trap oils and help you comply with SPCC and stormwater regulations. Oil-only absorbents included soak up hydrocarbons but repel water which flows through the UV-resistant bucket to lower drainage point. Top hose fitting accepts 3/4-inch hose ; 3/4-inch connection on bottom of bucket accepts included drain plug, included drainage hose or can be used as a free-flowing drain. The 20-gallon container holds oil-absorbent media to remove up to 5 gallons of oil, grease and hydrocarbons without taking in a drop of water. Disclaimer: Absorbents Notice - All absorbents take on the properties of the liquids they have absorbed. When handling used absorbents, you must utilize all necessary safety precautions that are required to safely handle the liquid which has been absorbed.