Hi. I am planning to install new kitchen faucet and noticed that there are two shut off valves under the sink. One of them is badly rusted and needs to be replaced. I noticed that it is connected to three pipes (one of which is kitchen faucet). The other is clearly water coming in. What is the third one connected to wall? Also how should I go about replacing this? Anything that I should be careful of? Thank you.Here's picture of shutoff valve.
Ditto on the picture. It sounds like a valve that supplies water to both the faucet and another appliance. If the line not going to the faucet is copper and measures 3/8 across (OD or outside diameter), likely a dishwasher. If it's 1/4 OD, likely a refrigerator ice maker. More important is what kind of pipe you have coming into the cabinet to the valve. An older house may have galvanized steel, typically nominal 1/2, which measures about 3/4 OD. Newer homes are more likely to have copper, typically nominal 1/2, which measures 5/8 OD. Hopefully, either will come into the cabinet for several inches before meeting the valve. Shut off the water downstairs, then disconnect the two smaller supply lines at the valve. For steel pipe, the valve is threaded onto it. Use two wrenches, one pipe wrench on the pipe itself, tensioned clockwise, then another to unthread the valve counterclockwise. For copper pipe, the valve is typically soldered on or has a compression connector with a fairly wide nut holding onto the pipe. Cleanest removal, with enough copper in the cabinet, is to use a mini tubing cutter and cut the copper right under/behind the valve, freeing the valve. Take the valve to the store and buy a match, preferably a quarter-turn ball valve. One glitch is the possibility that it's an old flare valve - meaning that the two lines you unhooked have flare nuts. If they're copper, I'd plan to slide the flare nuts back a little, cut off the flares at the end of the tubes, and get a new valve with all compression fittings. If the old lines are then too short to make it to the new valve, they can be cut back further, then extended with new copper, or short flexible water supply lines with compression fittings on each end. I'm still leaving out more stuff, but that's enough.
can't get your picture to load. is it the hot? is there a dishwasher a wee bit away from sink? is there something water related on the other side of the wall?
Im assuming that third pipe is to a dishwasher? Anyhow..you will have to shut off you main water valve, most likely located in your basement. Then crack open all faucets to drain any water in pipes, before you disconnect the water pipes and valves under sink. The other pipe may also be the hot water coming in...hard to tell without a picture!
You can install a pullout kitchen sink faucet on a wide variety of sinks. There are many options, but the same is not true for the other type of faucet sprayer: A spout sprayer. Let's say you have a old sink to work with. You're probably going to be able to install a pullout sprayer with little problems. You probably won't be able to do the same with a faucet sprayer built in to the spout on an older sink though. These are excellent when you want to spray and wash your vegetables. When you hold your vegetables under a typical faucet, you have to roll them around with your hands in order to loosen any dirt or other contaminants. The sprayer works like a mini hose and can do that work for you.
