Malcolm,
The sink water trap is equipped with a drain. At least it is in our '86
Syncro Westfalia and hopefully in other years and models. The drain is a
small screw with finger grip head. There is no need to put antifreeze in
the sink drain.
Larry

Malcolm Stebbins wrote:

> Sorry to keep this thread going, but I have read all of these and
> PLEASE don't forget to put some anti-freeze down the sink, into the
> water trap - my PO didn't, and I had to fix the cracked water trap
> due to frozen water in the trap <snip>