Mike,
I believe that the water tank drain caps changed size during the 1987 model year.  These have been hard to find, but last summer one of the list venders, Bus Depot I think, came across a supplier and had both in stock. Our van is a 87 Westy Syncro and it took two tries to get the correct one.  The sink drains use standard garden hose fittings so you can easily set up a gray water system.

Mark in AK

----- Original Message -----
From: Mike Miller <mwmiller@CWNET.COM>
Date: Wednesday, February 9, 2005 9:55 am
Subject: Water drain cap

> Volks,
>
> Anyone know if the water tank cap and the sink drain cap are the
> same on an
> '89.  They aren't on my 85, sink drain is much smaller than the
> water tank
> drain.
>
> Also are the 89 caps the same size as the 85 water tank drain cap?
>
> Mike
>