On 14 Feb 2007 17:02:30 -0800, "Bob" wrote:

On Feb 14, 6:49 pm, "HeyBub" wrote:


Faucets are optimized to prevent stuff from going in one direction, not the
other.

The suckage may be much greater than normal water pressure anyway.

But how can it suck air into a tank that is full of water without
forcing some of that water out somewhere? Wouldn't there have to be
much less pressure inside the tank than outside? Since liquids cannot
be compressed, there would have to be air already in the tank for a
pressure differential.


Hi Bob

Do you have an anti siphoning device on your water heater? This can
occur without one, either naturally or when work is done on the lines.
Around our area it's a standard item to have.

Regards
Dale