Off Valve
How do I change a under the sink water shut off valve?
The water shut off valve that is under my sink in the bathroom is leaking and I need to replace it. I am wondering if I need soder the new one or can I just put some thread tape around it.
More ofter than not the innards of a valve will deteriorate and start to leak, when that happens its best to replace the valve.
Since you ask about soldering the shut off valve, I'm going to assume that you have a copper line coming out of the wall. Older valves required soldering, nowadays there is a compression fitting that eliminates the need for soldering. Once you have the correct size of the pipe turn off the main water supply. Remove the old valve (may need to take a hacksaw or tubing cutter, if its soldered on). Then slip the new nut and compression ring over the pipe. Next bring the valve up to the pipe and tighten the nut to the valve.
Once the valve is secured on attach your lines, preferably new replaced lines. Open the valve line, and then turn on the main water line and check for leaks.
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