EDIT: It’s perfectly acceptable to solder soft copper.

Can you use copper fittings on soft copper?

When joining copper tubing together or to a system component in lieu of a brazed connection, the use of a mechanical connection is not new to our industry. Flare connections have been used for years, but they we’re limited to use on only soft (annealed) copper.

Can I use SharkBite on soft copper?

Can SharkBite fittings be used with soft copper or rolled copper? No. SharkBite fittings can only be used with hard drawn copper types K, L, and M.