Connect a Festool RTS 400 / DTS 400 sander port to a Festool D27 antistatic hose
How to join a Festool RTS 400 / DTS 400 sander port to a Festool D27 antistatic hose, and what stops it leaking dust.
Not a direct fit. Joining the Festool RTS 400 / DTS 400 sander port to a Festool D27 antistatic hose needs a 27 mm to 27 mm step reducer.
Rings drawn to scale from the measured diameters in the table below.
The two ends
| End A | Festool RTS 400 / DTS 400 sander port (1-1/16 in OD, 27 mm OD) |
|---|---|
| End B | Festool D27 antistatic hose (35 mm tip in OD, 7/8 in ID) |
| Fit type | male port into hose cuff |
| Reducer needed | 27 mm to 27 mm step reducer |
Shop notes
Measured across the joint between the Festool RTS 400 / DTS 400 sander port and the Festool D27 antistatic hose, the port (27 mm) is 4 mm larger than the hose (23 mm), so it will not seat. A 27 mm to 27 mm step reducer closes that 4 mm step so the two hold together instead of leaking at the gap.
A 4 mm mismatch feels close enough to force, and it will hold for a minute before it works loose under airflow. Fit the step ring rather than trusting friction on a gap this size.
The reducer to buy
Shop 27 mm to 27 mm step reducer on AmazonaffiliateFind 27 mm to 27 mm step reducer on eBayaffiliateRelated connections
- Festool RTS 400 / DTS 400 sander port27 mm (D27) hose port
- Festool D27 antistatic hose27 mm nominal, tip 23 mm ID / 35 mm OD
- DeWalt DWS779 / DWS780 miter saw port to Festool D27 antistatic hoseneeds a reducer
- DeWalt miter saw dust elbow (1-1/2 in outer) to Festool D27 antistatic hoseneeds a reducer
- DeWalt random-orbit sander stepped port to Festool D27 antistatic hoseneeds a reducer
- 35 mm EU power-tool port (DeWalt / Bosch / Makita) to Festool D27 antistatic hoseneeds a reducer