I started with goodyear air hose. that was a 55Gal disaster waiting to happen if it wasn't being watched. I still run air line on the return and truck filling hose. I use pvc on the suction side of the pump, and then hydralic hose I had made from the parts store. 1500 PSI hydraulic hose leaves me with no worries on the pressure side. You can pick one up from TSC with NPT ends for 20 bucks. The power steering line from the donor vehicle will work as will transmission lines, but the WP on trans lines is way lower then what the pump can output in the event of a blockage. The hydraulic line can handle whatever the pump puts all the way down to stalling the pump motor out or kicking in the pump bypass if it has one.
