Hose from heater to rear vents size?

[rallye dale]

As the title really, what size id is the cardboard hose that goes from the heater tube near the front to the rear vents on a westy

Save me from getting the bus out to measure :roll:

Cheers

 

[starbiscuit]

Do you mean this one?

http://forum.earlybay.com/viewtopic.php?f=4&t=64312

 

[rallye dale]

Yes cheers