Yes, they are all 1.5 flex, but reduced to 1" at the bulkhead. I think that is the original Bean Animal design. My used tank came with pre drilled 1" where I have the drains.
OK, hopefully putting them under water 2" in the sump will do it.
That is a bit scarey, as the main display will overflow at a high rate of flow if they were to somehow come out of the water in the sump.
Also, I thought I read of some people placing the safety emergency drain above the sump water level, so they could hear when it kicked in. But then it would not handle all of the flow by itself, which it is supposed to do?
Tom
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