Layumon22s
+1y
Since there is minimal price increase when going 1/4, 3/8 or even 1/2. I would go with at least 3/8. you can always put in speed controls, you can't make the valves/line bigger. I would do 3/8 valves, 1/2 line, then put speed controls on your dumps. just have to make sure you're system stays clean because those things can cause some junk build up if you use steel tanks and don't have a water trap