So, it looks like I need to replace my anti back-flow valve. When there was trouble, I removed the faucet handle and damaged a locking nut. The faucet is connected to an L-shaped pipe, made of copper. This copper pipe is then attached to a plastic one. What's the best way to detach the copper...
I occasionally visit here when Google gives me answers that I can't understand. Finally decided to join because I have a lot of issues with my 10-year-old house.