Check the listing for details. WOODRIVER Dust Connection 4" ABS Y-Fitting for Dust Collection System. Condition: New. Listed at 23.98 USD. NEW, WOODRIVER Dust Connection 4" ABS Y-Fitting for Dust Collection System, 85O16, 4" Y Dust Extraction Fitting, 4'' Opening, Rugged ABS Plastic, Abrasion Resistant, These economical fittings will help you build a high performance dust extraction system for your shop. Made of ABS plastic (except for the aluminum blast gates), these fittings are designed to stand up against the abrasive nature of saw dust and wood fiber. Universal Tool Adapter adapts your wet/dry vacuum hose to stationary or portable power tools. It's constructed of a tough material and conforms to slight variations in size. The "stepped" design contains a 1", 1-1/4", 1-1/2" and 2" external diameter and a 1-1/4", 1-1/2" and 2-1/2" internal diameter connection. It also has a square flange with mounting holes that can be used.