I installed a 12" siphon the last couple days. The MU guide says to drill a hole in the outlet elbow. The purpose is so water exit out the bottom so it will not freeze.

I have not seen any other diagrams with the hole drilled in the elbow. I thought the idea of the elbow was so it would hold water.

Should I drill or not?

I will start loading pics soon of the 10 acre lake I've built over the last 2.5 months, not including time to remove tree's and brush. It's been fun and more time consuming than I expected.