Nuetrik has a whole line of "speak on" type connectors that are designed for power connections.
http://www.neutrik.com/en/audio/powercon/
I used the powerCON 20A for my pumps. With the 2 diff colors, I know which is pump one & two.
Would it be possible to reduce the number of ball valves by using 3-way ball valves? For example 7 & 8 and 10 & 11 could be replaced w/2x3-way. Are there others? I'll need to spend some more time looking at the flow.
Great work by the way!
Chris