How hard is the bell mouth connection of air conditioning copper pipe (screwed with two wrenches)? Experienced people talk about their feelings.

Generally speaking, unless you push too hard, the bell mouth will not rot. Butt nut for bell mouth of copper tube of internal and external machines is almost the same as reinforcing other nuts with similar size. First, align the bell mouth with the joint, then tighten it by hand, and then reinforce it with a wrench. The large pipe (low pressure pipe) is slightly stronger. There is no need to use violent force, because the toughness of copper pipe is very good, and the horn will stick to the joint with a little force. In short, don't be too tight, just put it away.