On 10/08/2010 17:11, Jules Richardson wrote:
On Tue, 10 Aug 2010 15:53:08 +0100, Phil L wrote:
Why not just do it like I've drawn in this diagram:
http://tinypic.com/view.php?pic=25ja9gn&s=4

Each butt fills to the top, then overflows into the next, simples.

That means you need a tap on each butt, and you need to keep drawing
water from each butt in turn to avoid water sitting around too long in
any given one, surely? Having them connected at the base would avoid both
those issues (but the OP just needs to have all three butts on the same
level)

Another traditional solution is to use a siphon tube between each one.
The advantage of this is that there's no joints to leak, you just run a
length of hose. The downside is you have to prime it (not too hard) and
your siphon hose has to be below the tap outlet so it doesn't run dry,
or you'll have to prime it again.