This mixer has a collapsible propeller that fits 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. Motor is totally enclosed fan cooled (TEFC) for use in environments with splashing water and dust.