On your '90 (same as mine) the water fill cover can be opened with a short
piece of heavy wire, like a coat hanger, bent 90 degrees for about 1/4 of an
inch at the end.
Reproduction keys are also available (or were at one time) from Steve
Sandlin, http://steveslockshop.com/

On 5/17/07, PB <pbrattan@gmail.com> wrote:
>
> I don't know if I want to use the water tank, but it seems that I can't
> open
> the water refill cap without a key.  Where would I get one, or is there
> another "trick" to opening it.
>
> Patti
> '90 Westy automatic
>