Chas Hurst wrote:
"rb" wrote in message
. ..
At the top of a 40' well, we have a check valve prior to pump.

With the check valve below the pump, can a hand pump be put on and
used with the electrci pump?
Probably, but you will need a check valve between the hand pump and
the user for the electric pump.

In other words, the check valve there now keeps the water from flowing
back into the underground reservoir. When you add the hand pump, you
need to add another check valve in the pipe going to it to prevent the
electric pump from sucking air through the hand pump instead of water
from the ground. Both check valves are to stop back flow.

I'm assuming you want a way to get water when power is out??

Tom J