I am building a splitter and I have a 13hp motor, 22 gpm pump and a 5" cylinder. All my ports off the detent valve are 3/4", the pump has 1" ports. I looked at older threads here and I came up with 1 1/2" suction hose and 3/4" hose for everything else. If I use 1 1/2" hose and I use an adapter...