Drum Thief easily removes 500mL petroleum samples from 55 gallon (208 liter) drums. Manufactured in accordance with ASTM D4057. Place thumb over the top opening in the sample tube then lower to approximately 12 inches (30cm), then remove thumb from the opening to allow the oil to flow into the Drum Thief. To remove, place thumb back over the opening and remove the tube from the drum. Note: Coat samplers with a protective varnish when used with liquids that will attack nickel and bronze. All listed items are made of brass and bronze and constructed with heavy nickel plating and are anti-magnetic.