Appreciate the feedback. That is my backup plan if the hardware store doesn't have the fittings I need. The outlets were just a little too far pointed down. Thinking of using a lighter and a pin to make the hole, but I should bring my drill in case that doesn't work.The sump is not big enough to hold the water that drains when the pumps are off?
Drill a hole on the side of the return pipe that extends into the tank. Close to where it enters the tank. This will be your siphon break. Once the water drains to that point, air will enter and break the siphon. Doesn't have to be a big hole.