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Old 02/03/2008, 12:54 PM   #10
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Join Date: Feb 2003
Location: Pittsburgh
Posts: 20,867
Yes, all (3) bulkheads placed on the same horizontal centerline. You are correct, the up-turned elbow is what sets the failsafe level.

In this particular tank the horizontal center for the 1" bulkheads is at 4.25" from the top of the trim.

The bottom panel of the overflow box is 6" from the top of the trim. I had to cut the bottoms off of the elbows to get them to fit properly, as the overflow was siliconed in place long before I came up with this plan!

The front edge over the overflow is at the bottom of the trim. This way, even with the return pump off, the waterline is never visible from the display side of the tank.

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