My gosh, things keep piling on. I thought I was going to do a quick replacement of my refrigerators shutoff valve. Went downstairs to turn off the main and it doesnt even budge. This is a picture of the main. It appears as if I turns downwards into the wall. I could solder it, but I dont know how to purge the line of water. I could even do a sharkbite (ive read that they are up to code for mains which I didnt know) but...how should I do this? I dont really know how to deal with the turn. I should (and probably will) call a plumber but I really didnt want to spend so much money. Thanks for any advice.