Quote Originally Posted by Koolance View Post
Yes, you need to connect one pump's outlet to the other's inlet in back. We will be offering some new fittings soon to do this more easily. For series, you also need to swap the side plug with the included shorter one to combine the tanks. See the user manual for details on that.

Tim
So do you mean that the first pump will pump into the second pump's inlet, or the second pump's reservoir chamber?