Did a reservoir change today and took some pictures.
In picture 1 I disconnect the water return(left) and the water
pump(right) line from the top of the cooler. They remove very easily.
In picture 2 you are looking at the underside of the cooler top. The drain(left) and the water pump feed(right). I bought the grey connection from the electrical department at Lowes. They screw together making them a tight fit.
In picture 3 looking inside the reservoir you can see how the water pump connects to the lid of the cooler and the air line.
In picture 4 I carved out 2 sections so the water pump and air line fits flush and the lid closes snug.
When I buy a 150qt cooler I will set up everything the same.
I also hook up screens to the water pump lines along with the return lines. I clean them out when I do a reservoir change.
Will take more pictures as the tomato plants continue to grow.