Hey Jon-

You could add another intake for the other side of the manifold, but it's definitely not necessary, the volume of the factory hose is enough to support three or even four pumps. It's not worth dealing with adapting the odd size of the T1200 pump threads in my opinion. The difference in speed between it and the T800 only shows up when you're pumping hundreds of gallons of water, so the 75 or so gallons we're talking about moving won't be enough for the difference to show up.