Hi Malcolm, Hi Nuno

thanks for your advice. I really appreciate it.

With regards to the shut off valve.
I consulted several forums and people were discussing where to put the shut off valve - on the suction side or the pressure side of the pump.
Opinions are quite divided between the two. I decided to put it on the suction side as on the pressure side I am not sure how much pressure the pump would generate in the case of shutting that valve.
I only know I don't want to run the turbine without a shut off valve.

With regards to the CAT tank.
I thought it is an UAT tank. Anyway, the manual actually states that you should (if possibly) mount the CAT vertically as it makes sure that no air is in the tank.

The screw in the fill line I will definitely replace.

The clunk in the main tank is kind of ceramic material but was recommended for turbine use.

I will also replace that black tube from the main tank.

I am sure I will get the problem sorted. Must be a simple plumbing problem.

Thanks again for your help.

Ulrich

PS: Malcolm, would it be OK if I come over to your place and you could have a look. Just would make me feel better to have it checked out before the maiden.