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Thanks wysiwyg...Gotta give a shout out to Loki, he's helped me throughout all this planning.
Yes, that is correct, my T is what is feeding the fuge, not sure if i will lose a lot of pressure to push it back up to the return though?
I do think that ball valve in the fuge line is a far better idea, thanks.
1 question, if I want to shut it off for whatever reason, say because i have to drain 10gallons of water out, how do I shut all this off without overflowing or spilling etc?
Do I drill all 3 holes on the same line across height wise from the rim or does the emergency one need to be slightly higher?
So if I put that, than i can shut each one down, than turn off the skimmer and return pump and I'm safe right? than i just open and turn those on to be back up and running. For instance, when i need to clear out the gunk from the skimmer cup, id need to turn it all off right?

1 question, if I want to shut it off for whatever reason, say because i have to drain 10gallons of water out, how do I shut all this off without overflowing or spilling etc?
I have plumbed a drain into my main drain that has a ball valve. I can open the ball valve and easily get the water out for a water change.
I guess I don't understand what you want to shut off. You could put valves on everything, but your display will only drain down to the bottom of the teeth on the overflow box.
Do you have quick connects after ball valves? I would suggest in case you ever need to move plumbing for whatever reason.
Mike D "like the beastie boys" Sent from my iPhone using Tapatalk

Yes all three holes should be drilled on the same plane. It looks like your drawing has it correct. A 90 for the drain pointing down, a 90 for emergency pointed up and the return at the same level.
If you use loc line I would put the return nozzle at the resting level of the tank (or a little higher) so that it wont syphon water back into the sump.
If you want to shut the return pump off. The display will drain down to Its resting level. With you having such a big sump (compared to your display) I think there is a very small chance of an overflow.
A quick connect is in with the PVC in home depot...you glue the PVC in on each side and the quick connect unscrews so if you need to take plumbing out for whatever reason you can. Def a good idea IMO!
Mike D "like the beastie boys" Sent from my iPhone using Tapatalk

