Can I solder outlet side of a ball valve if the valve is closed and under pressure?

What is the best replacement valve cartridge for the Moen 620 shower valve?

I have a Tetco AC50 "HE" with a C36 "WC". My unit differs from the AC50 shown in their online manuals in that it has three refrigerant ports. A "high liquid", a "high refrigerant pressure, and a "low refrigerant pressure. The "low refrigerant" port is connected to a "modulating valve" that is a...

I have a constant drip in my bathroom sink. After a little trouble shooting, I came to the conclusion that my hot water valve underneath the sink is the culprit. I traced the pipe down the wall, into the basement and to the water heater. The only thing between the water heater and the old valve in...

Help and suggestions!! The middle handle, used to divert water from the tub spout to shower head is stuck in the 'tub' position. I have removed the handle and trim bezel and tried to turn the shaft with pliers - no luck & quit before marring the splines on the brass shaft. What now??