(1) Dust Collector with a 4" receiver / adapter (1) Shop-Vac 2.5" Hose - http://www.lowes.com/pd_71994-20097-9050311___ (1) Dust collector to Shop Vac Hose adapter, 4in to 2.5in (1, optional) Metric Brass Heat-Set Insert for Plastics, Tapered, M3-.5 Internal Thread, 3.8mm Length - http://www.mcmaster.com/#94180a331/=10pzugg (1, optional) M3-0.5 x 6mm Socket Set Screw - https://www.fastenal.com/products/details/40818?term=M3-0.5+x+6mm+Hex+Drive+Cup+Point+Black+Oxide+Finish+Alloy+Steel+Socket+Set+Screw