These are great quality plastic rotating and closable air vents which have a 51mm OD hose attachment. Will fit hose with 51mm ID and above. These dash outlets are used in some production vehicles and are a better quality & priced alternative to the Eberspacher and Webasto outlets.
Perfect for air outlets or demisters for vehicles such as cars, vans, motorhomes, boats, or anything that requires ducted hot/cold air.
The main fascia is the same no matter what size ordered, the only difference are the sized 'top-hats' that snap into the back of these units that fit your selected hose size.
Overall diameter of unit: 84mm (3.3")
Hole size required: 76.3mm (3")