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Glossary

Angle Stop

Angle Stop

This is a small shutoff valve located where a water pipe comes out of the wall. It connects the main water supply to a specific fixture like a toilet or sink. You can turn its handle to stop the water flow quickly if you've got a sudden leak.

Reviewed by John HomesUpdated June 29, 20263 min read

Origin

Plumbers call it an angle stop because the valve changes the direction of the water flow by 90 degrees. The term has been common in the plumbing trade since early indoor plumbing became standard.

How you'll see it used

  • The home inspector noted on page four of the report that the angle stop under the master bathroom sink is heavily corroded and needs replacement.
  • When the plumber gave a quote to install the new dishwasher, he included a small charge to replace the old multi turn angle stop with a modern quarter turn valve.
  • You look under the kitchen sink to shut off the water during a leak, but the angle stop handle is completely stuck from years of hard water buildup.

What is an angle stop?

An angle stop is a small plumbing valve that controls water flow to a single fixture in your house. Plumbers call it an angle stop because it changes the direction of the water by 90 degrees. The water pipe comes out of your wall, hits the valve, and turns straight up to reach your sink or toilet. You will usually see a small oval handle or a lever attached to it. Turning this handle shuts off the water right at that specific spot. This means you don't have to turn off the main water supply for the whole house just to fix one leaky faucet. There are two main types you'll see. Multi turn valves have an oval handle that you must spin several times to stop the water. Quarter turn valves have a straight lever that only needs a simple 90 degree flick to shut the water off. Quarter turn valves are much more reliable and easier to use.

Why it matters to you

Knowing how to use an angle stop can save your home from major water damage. If a toilet overflows or a sink pipe bursts, you only have seconds to act. You can reach under the sink or behind the toilet and twist the valve clockwise to stop the water instantly. Locating and testing these valves is a great task for Your First Week as a Homeowner. If you wait until water is gushing onto your baseboards, it's too late to figure out how they work. These small valves give you complete control over your plumbing. If you want to upgrade your bathroom faucet, you can just turn off the angle stops under that sink. The rest of your family can still take showers and wash dishes while you work.

Where you will find them

You'll find angle stops in almost every room that has running water. Common locations include:

  • Under the kitchen sink for the hot and cold water lines.
  • Inside bathroom vanity cabinets below the sinks.
  • Near the floor on the left side of your toilet.
  • Behind your washing machine or refrigerator ice maker.

Sometimes older homes have pipes that come straight up through the floor instead of coming out of the wall. In that specific case, the valve doesn't change the water direction at all. Plumbers call those straight stops. Even though the shape is a little different, straight stops do the exact same job as an angle stop.

What to watch for and repair costs

Angle stops often sit unused for many years. Over time, the rubber washers inside them dry out and get brittle. The metal parts can also corrode from hard water buildup. When you finally go to turn an old valve, it might feel completely stuck. If you force it, the valve could snap and cause a massive leak. Another common issue is a slow drip coming from the valve stem right after you turn it.

Never use pliers or a wrench to force a stuck angle stop handle. If you can't turn it easily by hand, you need to turn off your main house water valve and replace the angle stop entirely.

It's a smart idea to test your valves once a year. Just turn them off and back on again to keep the internal parts moving freely. If you need to replace a broken angle stop, the part itself is very cheap. A new valve usually costs 10 to 20 dollars at the local hardware store. If you hire a professional to do the plumbing work, expect to pay 150 to 300 dollars for the labor and materials. Keep in mind that costs vary based on where you live and how hard the valve is to reach. Handling a bad valve quickly prevents bigger home emergencies down the road.

Frequently asked

What is the difference between an angle stop and a straight stop?

An angle stop connects to a pipe coming out of the wall and turns the water flow 90 degrees upward. A straight stop connects to a pipe coming straight up through the floor and keeps the water flowing in the same direction. They both do the exact same job of shutting off water to a single fixture.

Why is my angle stop leaking after I turned it off?

The rubber seals inside the valve dry out and shrink over time. When you turn an old valve, the movement breaks the fragile seal and causes a slow drip. You can sometimes fix this by tightening the packing nut behind the handle, but you'll usually need to replace the whole valve.

Should I choose a quarter turn or multi turn angle stop?

You should always choose a quarter turn valve for your home. They use a stainless steel ball valve inside that rarely gets stuck or leaks. Multi turn valves use rubber washers that wear out quickly and cause frequent plumbing headaches.

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