So Alistair Bell says:
> 
> 
> A couple of weeks ago someone (Jack?) enquired about replacement screw
> caps for the water tank and sink external drains. I said that I had
> found an aftermarket drain tube that screws onto the sink drain plug - the
> threads are just plain "garden hose" threads. The water tank drain plug is
> a different matter. I've tried as many caps (from the lab) as I could
> find, and the one that comes closest, but doesn't really work, is a cap
> from a 50ml Falcon tube (mo-bi people know). I'll continue my search for a
> cheap substitute.
> 

Funny, I was sorta doing the same kind of search for the flue vent cover.
I've looked at all types of plastic bowls and tupperware.  I think VW (or
was it Delta Six?) really did their homework to come up with such a unique
sized cover so that nothing else will fit.  At least this recent RV place
deal is pretty reasonable.

Steven 

sjohnson@pcocd2.intel.com