Woods one piece sleeve or rubber insert for 4J series couplings. Woods brand couplings are standard equipment with many pump manufacturers and are also a great replacement for many other pumps. Woods in most cases use a three part coupling consisting of two flanges of various sizes and a rubber inset. These components are multi-cogged and allow for installations in either clockwise or counter-clockwise rotation. You can assemble any combinations of flanges to match your shaft diameters.