PVC sewer pipes come in two gauges. The regular material is .090 inch thick and is usually white in color. There is also a thicker type, often green, with a wall thickness of .127 inches. If your PVC pipe (NOT ABS) is the thinner version, the smaller end of the adapter will fit onto the sewer pipe as directed. I had no luck with the other end to fit my hose. I only have an unknown brand of hose, but it fits my table saw's factory dust collector as well as the 4" end of the Powertec 70136 4"x2-1/2" reducer, so I have to assume my hose has a fairly normal outside diameter. The outside diameter of the adapter is 3-61/64" and fits snugly on the inside of the large end of the 70125 adapter, so I'm not sure how the large end is supposed to fit onto a 4" hose. Large End The 70125 adapter is sized at 4-7/32" which is too large for a 4" hose. Luckily, the larger end is a similar size to the inside diameter of 4" PVC splices and curls. I secured it by putting a layer of blue painter's tape on the adapter and using a zip tie to secure the hose to the smaller end. Each port in my dust collection system is covered with blue masking tape so it can be replaced if necessary. I would rate the item "not as described" but still saw it could be useful.
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