An impeller designed for higher viscosity products. An anchor is normally "U" shaped, and follows the contour of the tank, with minimal clearance between the outside of the blade and the tank wall.  Anchor impellers are specifically designed to fit the particular process.  Two or four blades; with or without lower "tank bottom" blades; with either all-welded or bolted assemblies with adjustable blades.  Axial-flow impeller blades may be incorporated into the horizontal supports to aid in the vertical movement of of the product.  For removal of product from the tank wall for heat transfer or other needs, spring-loaded wipers (pictured above) are available in various compatible materials.