As high as you can easily pour coolant into it.  Mine is 3'.

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
JRodgers
Sent: Thursday, November 29, 2012 5:37 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Libby Bong and coolant change

Have to change the coolant in both of my '88GL's. Have decided to make a
"Libby Bong" for the task - but - I have found most of the recommended
dimensions for the bong - the one that eludes me is  how long or tall to
make it. I know instructions say tall enough to be over the height of the
radiator vent - but just how tall/long/high is that? Does anyone know??

Bong PVC pipe - 2in. dia by "X"in long?

Other parts --
Plumbqwik Reducer - 2 in down ti 1-1/2 in.
Nylon tube - 1/2 dia X  "X" in. long
Rubber band
Sticky/pucky to seal nylon tube to te PVC pipe.

Thanks,

John Rodgers