Profile: The Tank Depot, Inc. is an online source engaged in the supply of plastic tanks. We market underground plastic water tanks, flat bottom utility tanks, rainwater collection adapters, pillow tanks, water pressure booster systems, marine tanks and bio-diesel tanks. We also have pressure wash tanks, septic tanks and transport tanks. Our RV holding tanks are available in sizes upto 48 gallons and our RV water tanks are available upto 100 gallons. Our marine water tanks are made with polyethylene resin. Our rugged polyethylene pressure washing tanks are designed to handle the rough treatment of active businesses. Our biodiesel tanks / wine making tanks are made from medium density polyethylene with U.V. inhibitors and designed for containment of liquids of up to 1.7 specific gravity.