Quote Originally Posted by Edward88 View Post
Im not looking for dual loops, im looking for 2 d5 in series so beside the increment in flow or head pressure, it will be more reliable
Look at these photos. You have an inlet on the bottom and outlet on top. you can run in series by having the resevoir run to the center inlet of the first pump to the top outlet of the first pump into the bottom inlet of the second pump then out to the top or center outlet of the second.