Review on POWERTEC 70136 4 Inch 2 Inch Reducer by Larry Cho

Works as described. However, the dimensions shown are HOSE dimensions. This allows you to connect a 4" hose (e.g. from the dust collector) to a 2.5" hose (e.g. to the miter saw or router table). As others have noted, the outlet on your saw or the inlet on your dust collector is the same size as the larger side of the cone, so you can't connect it directly to your machine. I admit I made a similar mistake and had to return several items. However, this was my fault. I have used this item several times and it works great. The hoses are a little tight, but I think that's on purpose, maybe so you can connect the hoses without a clamp. However, I used clamps on both sides to be sure. I was able to connect the miter saw and milling table to the dust collector without any problems. I would recommend using as short a 2.5" hose as possible to maximize airflow when connecting to the 4" dust collector inlet.