As you can kind of see, the emergency is tee'd into the main drain line. I wish this would have been on its own drain line because tuning this herbie in for silence is very difficult when the sump is in the basement. Sometimes gravity pulls air through the emergency line when draining through the normal drain line, creating a loud air suction noise. It was very finicky to tune and as soon as the sump level changes by mere millimeters it starts all over again (thanks for ATO I don't normally have to mess with it)
Please note that there are ABS fittings on the drain line. It's not ideal. You want to choose either PVC or ABs and not interchange them but because this is only a drain line it's not that big of a deal (it's not under pressure).
Here's the sump before we fired everything up:
Since this pic we've added a check valve on the return line. This prevents water from back syphoning through the return lines in the main display in case of power loss.
Here's how we covered up the drain lines:
