I had ordered 5/16" ID tubing based on the size to fit the submersible pump, and later bought 1/4inch OD "T" connectors and 1/4 OD tube (.170 inch ID) at Lowes.
The "T"s were a little small for the larger 5/16 ID tube and too large for the .17 inch ID tube I bought to fit the valves.
I wrapped teflon pipe tape around the legs of the "T" that I attached to the large tube and sanded down the leg for the small tube. Then I used zip-ties to hold the tube joints.Hoping these won't leak.
The pump 3.6 (Lpm) and valves are all driven at 12 volts but the arduino is 5V. I used my car jump-starter as my 12V source.
Having a helping hand on the soldering station is nice.
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