Check the listing for details. WOODRIVER Dust Connection 2-1/2" ABS Union Fitting for Dust Collection System. Condition: New. Listed at 6.99 USD. NEW, WOODRIVER Dust Connection 2-1/2" ABS Union Fitting for Dust Collection System, 144541, 2 1/2'' Union Fitting, Rugged ABS Plastic, Fits Common Shop Vacuums, Used for connecting 2 1/2'' hose fittings without hose, Increase the versatility of your dust collection system or replace missing or worn out accessories on your existing shop vac or dust collector. These fittings allow you to set up a dust collection system for bench top tools using your shop vac, or use the 4" to 2-1/2" reducer and outfit your 4" system with a 2-1/2" hose and accessories. Union fitting is required to connect hoses together, or to other fittings. Shop Vac Hose Kit contains one 10' hose with end fittings, two straight wands, 14" floor tool, dusting brush and crevice tool.