What Is a Shower Diverter Valve? Types, How It Works, and Repair Tips

It's important to understand how your home's appliances and systems work so you know what to do if something doesn't work as expected. Diverter valves may sound technical, but they’re one of the most common pieces of plumbing hardware used in your home. Understanding how a shower diverter valve works, and what to do when it doesn’t, can save you time, money, and the frustration of a shower that won’t cooperate.

What Is a Diverter Valve?

If you aren't sure what a diverter valve is, think of it as an essential piece of your home’s water system. Here’s the easiest way to understand it: In a shower/tub combo, when you turn the knob on your shower faucet to redirect water from the tub spout to the showerhead, you’ve used a shower diverter valve. A simple pull of a handle or pin engages a rubber stopper that reverses the water flow, creating pressure that forces water from the tub spout toward the showerhead.

The valve's job is to do exactly what its name says: to divert the water flow from one place to another. Beyond showers, diverter valves also appear in heating systems — opening and closing pathways to direct hot water to radiators, showers, and taps.

It's also worth noting that diverter valves are often confused with mixer valves, which are the valves that blend hot and cold water to achieve a safe, consistent outlet temperature. The biggest difference between a diverter vs mixer valve is that a mixer valve is used when you want to change the outlet from which the water is coming.

Three Types of Shower Diverter Valves

When it comes to shower diverter valves, there are three common types:

• Tee diverter: The most common type: a simple straight-pull handle located on the tub spout. Pulling it up directs water to the showerhead, and pushing it back down returns water to the tub.  It’s easy to replace, typically by unscrewing the spout counterclockwise.
• Two-valve diverter: Fitted with two L-shaped valves found in the center of a standard faucet. A two-valve diverter adjusts water temperature with a single dial located between the two temperature taps.
• Three-valve diverter: Installed on two-tap faucets. Once hot and cold water taps are turned on, and the water reaches the desired temperature, turning the third valve diverts the flow to the showerhead. Turn it counterclockwise to return water to the tub.

A standard diverter valve sends water to one outlet at a time. For homes with multiple showerheads or handheld shower attachments in a single shower stall, a shower transfer valve (also called a diverter transfer valve) allows water to flow to multiple shower fixtures simultaneously.

How Does a Diverter Valve Work in Heating Systems?

A diverter valve in a home’s heating system is located in a combination boiler (also called a combi boiler), which combines space heating and domestic hot water into a single unit. The valve controls whether hot water is directed to your showerheads and taps, or to your heating system. When you turn on a hot water tap, the diverter valve prioritizes that demand; when you turn it off, it returns to heating mode.

How to Install or Replace a Diverter Valve

Shower Diverter Valve

It’s easy to install or replace a shower diverter valve with these steps:

• Remove your old showerhead. If it’s tightened over time, use a wrench to get a good grip.
• Place the new diverter valve into position in the pipe.
• Screw it tightly to prevent water pressure loss or leakage.
• Reinstall the showerhead by placing it into the diverter valve.
• Make sure all connections are tight, then test the valve to check for leaks.

Pro tip: If you encounter grout or cement inside the diverter housing, stop immediately and call a licensed plumber. Forcing removal can damage the pipe.

Tub Spout Diverter

The tee diverter on a tub spout is usually the most straightforward to replace and is almost always built into the spout itself. Before beginning, bring the old spout to a plumbing supply store to ensure you purchase a compatible replacement.

• Turn off the water supply to the shower and tub.
• Remove the existing tub spout. (Most spouts unscrew counterclockwise by hand or with a wrench. Some have a setscrew on the underside that needs to be loosened first.)
• Install the new spout (with built-in diverter) by screwing it on clockwise until snug, using plumber’s tape on the threads for a watertight seal.
• Test by pulling the diverter valve and checking for leaks at the tub spout and showerhead connection.

View our plumbing maintenance guide for more preventive care advice.

Diverter Valve Maintenance and Repair

Diverter valves are durable, but they do wear out, especially in homes with hard water, which causes mineral buildup that can clog or corrode the valve over time. Most shower diverter valves last 10 to 15 years, but rubber components may need attention sooner.

Here are signs your shower diverter valve is failing:

• Water comes out of both the tub spout and the showerhead at the same time
• Reduced water pressure at the showerhead
• The diverter handle won’t stay in the “up” position
• Visible rust or discolored water from the showerhead

How to Fix a Shower Diverter Valve

Start with the simplest fix: tighten the screws behind the valve’s faceplate. If water still leaks from the tub spout while showering, the internal rubber washer is likely worn. Remove the valve and inspect the washer; if it’s damaged or corroded, replace it.

For valves with mineral buildup, soaking the parts in white vinegar overnight can dissolve deposits. Repair kits for mechanical diverters typically cost $5 to $25 at any hardware store.

For proper maintenance, always release the diverter valve after showering, letting water run from the tub spout for a few seconds before shutting off the water completely. This relieves pressure on the valve and reduces wear.

Related: How to Fix a Leaky Showerhead

Does a Home Warranty Cover Diverter Valve Repairs?

Home warranties offer a convenient repair/replacement solution when covered appliances and systems unexpectedly break. If your covered shower diverter valve fails due to normal wear and use, a First American Home Warranty plan can help cover the cost of getting it fixed. Plumbing coverage can include functional valves such as shower diverter valves, tub diverters, angle stop valves, and other plumbing components.

Learn more about our plumbing coverage, and get a home warranty quote today.

And remember, First American Home Warranty can help protect more than your plumbing. Coverage is also available for your home's electrical and HVAC systems, as well as for major household appliances such as dishwashers, ovens, ranges, cooktops, refrigerators, washers, dryers, and much more.

FAQs About Tub and Shower Diverter Valves

Does a home warranty cover diverter valves?

Yes. First American Home Warranty plans include coverage for functional plumbing valves, including shower diverter valves and tub diverter valves, when they fail due to normal wear and use. See your home warranty contract for full details.

How do I know if my shower diverter valve is bad?

Signs of a failing shower diverter valve include water coming from both the tub spout and showerhead at the same time, reduced water pressure at the showerhead, the diverter handle not staying in the “up” position, and visible rust or discolored water.

Can I replace a shower diverter valve myself?

Tee diverters on tub spouts are generally DIY-friendly. The spout usually unscrews counterclockwise for removal, and a matching replacement part is easy to find at any hardware store. Wall-mounted or in-wall diverters are more complex. If you encounter grout or cement inside the valve housing, stop and call a licensed plumber, since forcing it can damage the pipe. A plumber can typically complete the job in one to two hours.

What is the difference between a tub spout diverter and a shower diverter valve?

A tub spout diverter is the pull-up pin located on the tub spout and is the most common, usually easiest type to replace. A shower diverter valve (two-valve or three-valve) is located within the wall behind the faceplate and controls water flow between multiple shower fixtures. Both serve the same purpose but differ in location, mechanism, and complexity of repair.

The contents of this article are provided for general guidance only. First American Home Warranty does not assume any responsibility for losses or damages as a result of using this information.

Please be aware that if you disassemble a covered system or appliance, it can invalidate your home warranty or manufacturer’s warranty.