You definitely need to remove that and any rubber or plastic components while soldering anywhere near the valve.  

You can save money by installing all plastic shower pans and plastic walls, but being a plumbing contractor we encounter cracked shower pans almost every day and we encounter the drains leaking in plastic shower pans because when people stand on shower pans the plastic flexes and the drain strainers loosen causing significant damage.

The tenants texted this morning and said that she had had a surgery and couldn’t be there because they were staying with family.

It's like the difference between brain surgery and first aid. 

SORRY advance warning gross discussion but this is the fix: two 5 gallon plastic buckets fill 15% with water buy a "plank" online and put peanut butter on the end.

I had my concrete guys bring over 3 bails of hay that we needed for erosion control instead of paying them to spread it I did it myself  :)  and instead of paying someone to pick up the trash the subs leave at our projects I grabbed the big plastic bags and walk around and pick it up myself.. that saves me the high dollar laborer and I get to look at every corner of the new build or lots we are working on.. 

It was a 2800 square foot medical condo unit, in a great part of town, rented out to a plastic surgeon.

@Leo Hunter I hear ya I am going through the same with the VA, I stopped being able to run in 2018 even after 3 LODs and 3 surgeries.....I understand.  

The steps of Brain Surgery seem simple too, but ($1) to make tbe cut--($1 million) to know where to cut..

Any termite plastic traps (with wood bait inside) around the perimeter of the home- that look "old"?