Connect a Cabinet table saw 4 in cabinet port to a 1-7/8 in shop-vac hose
How to join a Cabinet table saw 4 in cabinet port to a 1-7/8 in shop-vac hose, and what stops it leaking dust.
Not compatible without stepping down. A 1-7/8 in shop-vac hose is far larger than the Cabinet table saw 4 in cabinet port, so it needs a 4 in to 1-7/8 in step reducer.
Rings drawn to scale from the measured diameters in the table below.
The two ends
| End A | Cabinet table saw 4 in cabinet port (3-15/16 in OD, 99 mm OD, 91 mm ID) |
|---|---|
| End B | 1-7/8 in shop-vac hose (1-7/8 in ID) |
| Fit type | male port into hose cuff |
| Reducer needed | 4 in to 1-7/8 in step reducer |
Shop notes
The hose is about 48 mm and the port about 99 mm, a gap of 51 mm, so the port simply swallows the hose with no contact. A 4 in to 1-7/8 in step reducer is needed, and even reduced the airflow is mismatched between the Cabinet table saw 4 in cabinet port and the 1-7/8 in shop-vac hose.
Wrapping tape to close a 51 mm gap never seals cleanly and chokes the airflow further. Step the sizes properly, or pair each end with a fitting closer to its own size.
The reducer to buy
Shop 4 in to 1-7/8 in step reducer on AmazonaffiliateFind 4 in to 1-7/8 in step reducer on eBayaffiliateRelated connections
- Cabinet table saw 4 in cabinet port4 in cabinet dust port
- 1-7/8 in shop-vac hose1-7/8 in (approx 48 mm)
- 1-7/8 in shop-vac hose to 2-1/2 in shop-vac hoseneeds a reducer
- DeWalt DWS779 / DWS780 miter saw port to 1-7/8 in shop-vac hoseneeds a reducer
- DeWalt miter saw dust elbow (1-1/2 in outer) to 1-7/8 in shop-vac hoseneeds a reducer
- DeWalt random-orbit sander stepped port to 1-7/8 in shop-vac hoseneeds a reducer