I am having trouble figuring out the directions for the EK 150 advanced reservoir. Do the current locations of the compression fittings seem ok? Also, I have tightened down compression fittings on my pump but can slightly see the O-ring. Is this going to cause any issues?
The 'normal' orientation would see the res the other way up,
The bottom as return pipe and the side port as the pump feed,
The port at the top is then free for filling/bleeding duties,
You want to avoid turbulence as much as possible to avoid air bubbles getting into to tubing,
The O-ring is fine as long as its tight, I have a couple of fittings that don't have recesses for the seal so the get squished, no leaks here
You can check the W/c sticky for more tips though, top of the section
Guessing the bottom photo is mounted on your pump? Also, much of the setup/orientation of these reservoirs depends on your loop plan and how and where you want water to enter and exit the reservoir. Also make sure that you plug any unused ports...otherwise, you'll have an indoor PC sprinkler system.