dart pump question

[Lance]

Originally Posted by christyf5

Oh cool. I still don't get the reason for the gate valve?? Dumb it down for me

The gate valve enables you to match the water being pumped back to the tank with the water draining into the sump. And if you have a gate valve on the drain line as well, it makes it easy to turn off the drain water for whatever reason: repairs, feeding, etc.