How it connects
The mating cylindrical collar adapter inserts into the seat socket and rotates a partial turn to engage radial locking tabs beneath internal socket lugs, compressing a flexible sealing gasket.
Male and female halves
Female socket/seat with internal bayonet lug recesses that mates with a male cylindrical adapter collar having exterior tabs.
Usually connects to
- DV90 turn-port male adapter collar
- 4-inch flexible dryer transition duct via turn adapter
Common sizes
- Nominal 4 in (100 mm) dryer duct airflow class; socket receiving diameter approximately 110.5 mm.
Where it is used
residential laundryclothes dryer exhaust ventingtight-space HVAC ventilation
Variations
- White ABS molded elbow socket
- Translucent black polycarbonate/ABS elbow socket
How to recognise it
Recognized as a circular plastic collar port on the side of a compact 90-degree dryer elbow fitting featuring internal perimeter retaining rim recesses and rotational guide markings ('close <---> open').
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Standard 4-inch sheet metal duct slip joint | Standard slip joints use plain cylindrical push-fit friction/crimp without rotational twist-lock lugs or dedicated collar seats. |
| Magnetic dryer vent coupling (e.g. MagVent MV-90) | MagVent couplings mate using magnetic attraction rings rather than a mechanical twist-to-lock tab/lug port. |
Also called
DV90 turn-port socketdryer vent elbow twist-lock collar seatdryer hose connector turn port seat
Good to know
Proprietary connection format found on molded aftermarket tight-clearance dryer vent elbows (often labeled DV90). It is designed to allow toolless attachment and rotation of a 4-inch dryer hose collar.
Related connections
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