I have all my parts collected for building my new "Roof Machine". Currently, I have the Delavan 5800, 200' of 1/2" hose as my roof machine. I am building a 5hp, 4 roller pump that will give me 9gpm and 200psi. I am looking for hose size recommendations. I'm thinking 3/4" would work good. The pump outlets, plumbing, by-passes are all 3/4", so I really don't see going down in size as an option. What do you guys think?