Currently 3 accessories: Original model added on 2/4/14 was that of a 3.5"->2.25" reducer instead of a true 4"->2.25 reducer. Sorry about that mistake. 3) 8/24/14 Added: True Universal 4" to 2.25 hose reducer/adapter Description: reducer connects 4" shop equipment to a standard size 2.25 hose vacuum. Alternatively, you may use my "Universal 2.25" hose to shop equipment adapter" to connect this adapter to standard 2.25" hoses. File needed: 4inchTo2.25inchReducerV2.stl Picture file: 4inchTo2.25inchReducer.jpg Recommended printer settings: 2 perimeters 25% infill *.3mm layer height Tapers from 3.4" to 4.1", so you may also use this reducer on 3.5" shop equipment to save on filament! 2) 4/17/14 Added: Universal 2.25" hose to shop equipment adapter Description: the adapter connects separate hose pieces to shop equipment. Recommended printer settings: 2 perimeters 30% infill .2mm layer height 2mm raft layer Additional info: You might need to sand off tip if you don't apply the 2mm raft layer to prevent warping at the base. Threads are there to help prevent hose slipage! Tight fit! Files: hose-2-equipment-coupler.stl 1) 2/4/14 Added: Universal 3.5" ->2.25" hose adapter/reducer Perfect fit 3-4 mm thick, nice and strong *30% infill, .35mm layer height Files needed: 3.5inchTo2.25Reducer.stl picture file: 3.5inchT02.25Reducer.jpg