I purchased this from Ace to replace a failing pump, but after the install the pump started making a bumping noise within a week. Of course guests were in town and I needed water immediately, so I had Horry Well come out and install a new one. I hate to throw away a good motor so if anybody wants a free Flo-Tec pump motor, come and get it. You can have the pump with it, if you want it. It was still working but making a noise. This is the 2 wire with ground model and uses an external pressure switch. It's free, come and get it.