I have seen them done using a 5gal bucket with a toilet flapper valve
installed in the bottom. Just cut out the hole, install the mount that
normally goes in the bottom of the tank. A float will open it and gravity
does the rest. Make sure you plumb a pipe above the level of where it should
"flush". That way you have a over flow preventer just in case the flap ever
gets stuck down.

Tre'

"Frederik" wrote in message
...
Hi there,
I'm looking for a DIY wavebox design - any & all tips, hints & links would
be greatly appreciated. To be precise: I'm not looking for bucket-type
surge devices, but internal, pump-driven wave creating devices.
Thanks
Frederik