Motor is UL listed for use in environments with flammable gases and combustible dust. Screw this mixer into the opening of a drum. The propeller is collapsible to fit through 55-gallon drums with a NPT opening size of 2, so there's no need to remove the lid. Also known as a direct-drive mixer, it operates at high speeds for rapid turnover. Use it to mix liquids with a viscosity similar to water and light oils. Propeller is left hand and moves clockwise when viewed from above to direct flow downward for efficient mixing.