I think is 1100. I never timed the original system but the new configuration filled the 750's at 7.5 minutes each and the center bag at 13.5. The flow is at least double. The valves cost $44 each on Amazon. The hardest part is getting the hoses off of the barb fittings. You can mount the valves on the existing manifold but the locations are close together and you have to take the valve controls apart to get them in there. I ended up making a new one and reorganizing its layout.