Thank you so much!! 🎉The HVAC installer put the corrugated gas line inside the furnace housing, which is a huge no-no. One can’t even trust the HVAC contractor it’s just best to do it yourself.
What kind of furnace is that? That looks like a Carrier. That's a good furnace. I just installed one of those today. As another comment said. A good pipe wrench and a crescent wrench makes the job super easy