On Jul 20, 6:50 am, "Edwin Pawlowski" wrote:
kjpro @ usenet.com wrote in message

...



Don't you think his water system has a check valve?

I don't know of many that do. Mine certainly does not. Not in my last
house either. Or the one before that. Why do you think he has one?

Backflow preventers are relatively new in residential applications also. I
have four in my commercial/industrial buildings, none in residential.

Perhaps because he is on a well and I have never seen or heard of a
well system without one. The footvalve _is_ a checkvalve and if it is
a submersible, the checkvalve is built in. If there wasn't one, the
pressure tank would empty back into the well every time the pump shut
off.

Harry K