Installing a bathtub faucet with a shower diverter is not always a simple faucet replacement. The installation method depends on whether you're replacing only a tub spout or installing a complete wall-mounted system with an in-wall valve, tub spout, diverter, and handheld shower.
The good news is that once you understand the plumbing layout and the rough-in requirements, the process becomes much easier to plan. This guide walks through the main steps, from checking the existing plumbing to testing the finished faucet.
Before You Start
A tub spout replacement and a concealed wall-mounted faucet require different installation methods.
Valve depth, outlet locations, and finished-wall thickness need to be correct before the wall is closed.
Leak testing is much easier while the plumbing connections are still accessible.
What Is a Bathtub Faucet with a Shower Diverter?
A shower diverter controls the direction of water flow. Depending on the faucet design, it allows you to switch between the tub spout and a handheld shower without installing two separate water controls.
The important distinction is how the diverter and valve are installed. Some bathtub faucets use a diverter built directly into the tub spout. Others use a separate diverter control or an integrated diverter within the faucet assembly.
For a new wall-mounted installation, the faucet is normally connected to an in-wall mixing valve. The valve receives the hot and cold water supply and directs the mixed water toward the selected outlet.
The visible faucet is only part of the system. The concealed valve and water connections determine how the finished faucet operates.
First, Identify Your Installation Type
Before buying fittings or removing the existing faucet, determine which type of installation you have. RBROHANT offers several bathtub faucet configurations, including wall-mounted tub faucets and other tub filler options.
Diverter Tub Spout
Best suited to replacing an existing tub spout when the current plumbing and valve can remain in place.
Wall-Mounted Tub Faucet
Requires careful planning of the concealed valve, water supply, tub spout, and shower outlet.
Tub & Shower System
A broader setup that may combine a tub spout, handheld shower, and overhead shower.
Understand the Rough-In Before You Start
The rough-in is the plumbing installed behind the finished wall. This is the part of a wall-mounted bathtub faucet installation that requires the most attention because it becomes difficult to access once the wall and tile are finished.
Before closing the wall, confirm the valve depth, hot and cold water connections, tub spout outlet, handheld shower outlet, and the final position of the trim.
Do not close the wall yet. Test the plumbing and confirm the rough-in dimensions first. Correcting a hidden connection after the finished wall is installed can require removing tile or drywall.
Tools and Materials You May Need
The exact tools depend on the faucet and the existing plumbing, but most installations may require:
Always use the installation manual supplied with your specific faucet as the final reference for fittings, sealing methods, dimensions, and tightening requirements.
How to Install a Wall-Mounted Bathtub Faucet
The following steps describe the general installation sequence for a wall-mounted bathtub faucet with a concealed mixer valve and shower diverter. Your specific model may use different fittings or connection methods.
Turn Off the Water Supply
Shut off the water supply before working on the plumbing. Open a nearby faucet to release pressure and allow remaining water to drain. Keep a bucket and towels nearby for residual water in the lines.
Confirm the Valve Layout
Identify the hot and cold inlets and the outlets leading to the tub spout and handheld shower. Use the markings on the valve as your primary reference rather than assuming the connection positions.
Hot water is commonly connected on the left and cold water on the right, but the actual valve markings and installation instructions should always take priority.
Install the Rough-In Valve
Secure the in-wall valve to suitable framing or blocking. The valve must remain stable when the finished faucet controls are operated.
Pay close attention to the manufacturer's rough-in depth. The finished wall thickness affects how the trim and control handle sit against the wall.
A secure and correctly positioned valve makes the final trim installation much easier.
Connect the Hot and Cold Supply Lines
Connect the hot and cold supply lines to the corresponding valve inlets. Use compatible fittings and the sealing method specified by the faucet manufacturer.
Before connecting the mixer valve, flush the supply lines if required to remove debris that could enter the valve or cartridge.
Connect the Tub Spout and Handheld Shower
Connect the valve outlets to the tub spout and handheld shower according to the faucet's installation instructions. Support the pipe runs properly and confirm the outlet positions before the wall is closed.
Check the tub spout reach and height in relation to the bathtub. The outlet should direct water cleanly into the tub without hitting the rim or surrounding wall.
Test the Plumbing Before Closing the Wall
Turn the water supply on slowly and inspect the valve, supply lines, tub spout connection, shower outlet, and diverter. Run the water through each outlet and check for leaks.
Finish the Wall
Once the plumbing has been tested and the valve is correctly positioned, the finished wall can be completed. Leave the required clearance around the valve and outlets so the decorative trim can be installed correctly.
Install the Trim and Controls
Install the trim plate, handle, and diverter control after the finished wall is complete. Follow the manufacturer's instructions for each component and avoid excessive force when tightening decorative parts.
Finish the Faucet Installation
With the trim installed, connect the tub spout and handheld shower according to the specific faucet design. Threaded, slip-on, and set-screw connections are not interchangeable, so use the method specified for your model.
The handheld shower hose should hang naturally without sharp bends. If the holder is mounted separately, choose a practical position that can be reached easily from the bathtub.
Finally, operate the diverter several times. Confirm that water switches cleanly between the tub spout and handheld shower and inspect the connections again after the system has been running for several minutes.
What If You're Only Replacing the Tub Spout?
If you're replacing an existing diverter tub spout rather than installing a complete wall-mounted faucet, the process is usually much shorter.
Common Bathtub Faucet Installation Mistakes
Most installation problems are not caused by the visible faucet itself. They usually start with the rough-in, connection method, or final testing.
When Should You Call a Plumber?
A professional is worth considering when the existing plumbing needs to be relocated, the pipes are badly corroded, the rough-in dimensions do not match the faucet, or the installation requires new concealed plumbing.
For product-specific dimensions or installation documentation, you can also contact RBROHANT support before starting the installation.
Frequently Asked Questions
Can I install a bathtub faucet with a shower diverter myself?
Do all bathtub faucets with shower diverters install the same way?
Do I need plumber's tape on every connection?
Should I test the faucet before closing the wall?
Is hot water always on the left and cold water on the right?
When should I call a plumber?
Wall-Mounted Tub Faucet with Hand Shower
If you're planning a wall-mounted bathtub installation, this type of setup combines a tub spout and handheld shower with a hot-and-cold mixer and diverter. The wall-mounted design keeps the bathtub deck clear and places the main controls within easy reach.
Final Thoughts
Installing a bathtub faucet with a shower diverter is mainly about getting the plumbing layout right before the finished wall is closed. The visible faucet may look simple, but the concealed valve, supply lines, outlet positions, and rough-in depth all affect the final result.
If you're replacing only a tub spout, start by identifying the existing connection. If you're installing a complete wall-mounted system, spend more time on the rough-in and leak testing before moving on to the finished wall.
For more options, browse the full tub filler collection or compare tub and shower systems if you need a different configuration.
