I have a gate on my drain, nothing on my emergency just it gets plugged. On the return I am running a check valve, which I reccomend. In 3 years I have not had anything overflow with this set up.
On my cube I had ball valves on the return and drain... no check valve. Now this set up I Had a spill once which fried a powerbar. everytime I did a water change I had to close the return line, there were a few times I almost forgot.
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