Regarding water supply, the hydrant has 3 outlets, two 2.5" and one 4", hook up all three, get the largest hooked up a.s.a.p.and put gate valves on the other two outlets. When you get a chance, hook up the other two outlets to the engine's 2.5" intakes and increase the water supply capacity to the engine by 200 to 500 gpm's more. Remember, the more holes you put in a bucket of water the faster the water will come out and the more water will come out as well.