How it connects
Slides over (female) or inside (male) a mating duct pipe; axial slits flex to accommodate minor diameter tolerances before being clamped tight with an external worm-drive hose clamp or foil tape.
Male and female halves
Dual-gender (reversible male/female): can function as female by expanding over an external pipe OD or as male by compressing into an internal pipe ID before clamping.
Usually connects to
- 4-inch rigid metal round duct pipe
- Dryer exhaust outlet collar
- Duct wall vent pipe or elbow fitting
Common sizes
- Typically nominal 4 in (102 mm) ID/OD for residential clothes dryer venting, and 3 in to 8 in in general HVAC ducting.
Where it is used
residential clothes dryer ventingHVAC exhaust ducting
Variations
- Straight factory-slit cuffs on semi-rigid aluminum duct
- Field-slit plain duct ends
- Soft cuffs
How to recognise it
Look at the end of a round duct or transition cuff for short axial cut slits/notches around the circumference of the metal collar, allowing expansion or compression.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Crimped male duct end | Crimped duct ends have corrugated ridges around the perimeter to reduce diameter without cut openings, whereas slit cuffs have distinct cut slits through the sheet metal wall. |
| Smooth round duct collar / slip-joint | Standard slip collars are solid continuous metal rings without relief notches or slits. |
Also called
slit-cuff duct endslotted duct collaradjustable dryer vent cuff
Good to know
Commonly supplied on OEM and aftermarket clothes dryer transition ducts (e.g. Whirlpool/Amana 4396033RP). The slits provide diameter flexibility so the same cuff fits either over or inside nominal 4-inch duct fittings.
Related connections
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