Big Horn 11429 high quality 4 inch x 2-1/4 inch Eccentric Reducer is a replacement for Jet JW1000 and provides a step down from a larger main line to smaller branch lines. This step-down increases air velocity near the machine where it’s needed most. Rugged construction makes it a great product that can be used for a long time. Connects to a standard 4 inch and 2.25 inch hose but must be secured using hose clamps.