Originally Posted by dirwoody
Not sure about the location, but I'd go bigger than 1.25"
1 1/4 supports 5900 gph.
Even if the 1200's operated at max efficiency then you'll still be well within the limits.
But it may be easier to mount 2x 1inch thru hulls in different locations. The "bus" for 4 pumps may be a bit complicated.