Cary, I've always seen them called deck keys.

Todd T

On Fri, Jun 11, 2021, 2:46 PM Cary Tolbert <retiredtoby at gmail.com> wrote:

> Thanks Rick. I knew there had bo be a special tool.
>
> Cary
>
> On Fri, Jun 11, 2021 at 2:21 PM Rick Lange <sloopblueheron at gmail.com>
> wrote:
>
> > Hi Cary,
> >
> > It is called a fill cap key at any marine supply house.
> >
> > Regards,
> >
> > Rick Lange
> >
> >
> > On Fri, Jun 11, 2021 at 12:56 PM Cary Tolbert <retiredtoby at gmail.com>
> > wrote:
> >
> > > There is a water fill cap on the starboard  forward part of the deck.
> > There
> > > is a slender shallow slot to loosen and tighten this flat surface cap.
> > What
> > > is the best tool to use. Surely someone has solved this problem.
> > > Thanks!
> > >
> > > Cary
> > > S/V Whisper '86
> > >
> >
>