How to Fix a Shower Diverter on a Tub Spout
About This Project
This guide provides instructions for fixing a faulty shower diverter located on a tub spout. The most common issue is water leaking from the spout when the shower is engaged. The typical solution is to remove the old tub spout and replace it with a new one, as repairing the internal diverter mechanism is often not practical or possible.
Best for homeowners and DIY enthusiasts with basic plumbing knowledge and familiarity with power tools.
Tools & Materials
LED UV Backlight Flashlight 900221
Anvil Yellow 3-Piece Metal Indoor Outdoor Bistro Set, Patio Foldable Round Table and Chairs Set FY-W1586P143143
Milwaukee Precision Phillips/Slotted Flat Head Combination Screwdriver Set (4-Piece) 48-22-2604
DANCO Diverter Tub Spout with Slip Fit and IPS Connection in Chrome 88703
Rag
GE Tub and Tile Silicone 1 Caulk 10.1 oz Kitchen and Bath Sealant White 2749484
LED UV Backlight Flashlight 900221
This ultra-bright 28 LED UV blacklight flashlight has a durable rugged aluminum construction design. This blacklight flashlight will make scorpions glow brilliantly, illuminating and revealing themselves
Anvil Yellow 3-Piece Metal Indoor Outdoor Bistro Set, Patio Foldable Round Table and Chairs Set FY-W1586P143143
Enjoy friendly conversation and a cappuccino with the Indoor/Outdoor 3-Piece Bistro Set. This Garden 3-piece folding patio set, featuring 2-dining chairs and 1-dining table. With its simple and practical
Milwaukee Precision Phillips/Slotted Flat Head Combination Screwdriver Set (4-Piece) 48-22-2604
Milwaukee Precision Screwdrivers feature an All-Metal Core for up to 4X strength. Precision machined tips provide secure fitment and long life. The extended reach design and longer shanks deliver improved
DANCO Diverter Tub Spout with Slip Fit and IPS Connection in Chrome 88703
Update your bathroom with the Danco Tub Spout with Diverter in Chrome. This simple DIY project will allow you to add a new style to your bath or replace an older tub spout that no longer works. Eliminate
Rag
Handy for cleaning or wiping tasks.
GE Tub and Tile Silicone 1 Caulk 10.1 oz Kitchen and Bath Sealant White 2749484
GE Tub and Tile Silicone 1-Sealant is a 100% waterproof, 100% silicone sealant ideal for areas susceptible to moisture, such as sinks, tubs, showers, fixtures, countertops, backsplashes, and other plumbing
Steps
Identify Spout Type and Gather Tools
5 minsFirst, identify the location of the setscrew on the old tub spout. It is typically found in a small recess on the underside of the spout, close to the wall. Shine a flashlight into the recess to determine if it requires a hexagonal Allen wrench or a flathead/Phillips screwdriver. Gather all necessary tools, including the Allen wrench set, the new replacement tub spout, a rag, and a tube of silicone caulk. Before you begin work, place the rag over the tub drain to catch any dropped items.
Remove the Old Tub Spout
5 minsInsert the correctly sized Allen wrench into the setscrew on the underside of the tub spout. Turn the wrench counter-clockwise to loosen the screw. You do not need to remove the screw completely, just loosen it enough (2-3 full turns) to release its grip on the copper pipe. Once loosened, firmly grip the spout and pull it straight off the pipe. You may need to gently twist it back and forth to break any seal from old caulk or mineral deposits.
Clean and Prepare the Pipe Stub-Out
5 minsWith the old spout removed, inspect the copper pipe stub-out. Use a utility knife to carefully scrape away any old caulk or plumber's putty from the wall around the pipe. Use a clean rag, perhaps dampened with mineral spirits if the residue is stubborn, to wipe the pipe and the surrounding wall tile clean. A clean, smooth surface is essential for the new spout to sit flush and for the new caulk to adhere properly.
Install the New Tub Spout
5 minsTake the new replacement tub spout and ensure the setscrew is loose enough to allow the spout to slide over the pipe. Align the spout and slide it onto the copper pipe until its base is completely flush against the finished wall. Make sure the diverter pull-knob is facing up and the setscrew opening is facing down. Hold the spout firmly against the wall and use the Allen wrench to tighten the setscrew clockwise until it is snug. Do not overtighten, as this can crimp or damage the copper pipe. Give the spout a gentle tug to confirm it is secure.
Caulk the Spout and Test Operation
5 minsTo prevent water from splashing behind the wall, apply a thin, continuous bead of 100% silicone caulk around the top and sides of the tub spout where it meets the wall. Leave the bottom un-caulked to allow any trapped moisture to escape. Smooth the caulk bead with a wet finger or a caulk finishing tool for a professional look. Allow the caulk to cure fully as directed by the manufacturer (typically 12-24 hours). Once cured, turn on the water to the tub spout. Pull up the diverter knob and check that water flows properly to the showerhead and that the old leak from the tub spout has stopped.
Common Problems
Caulk gets pulled away from the joint if tape is removed too late.
Solution: Removing the tape before the caulk skins over prevents the caulk from being pulled away from the joint.
Using a pipe wrench can damage the spout's finish. Only use it on fixtures you are discarding.
Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.
Turn the new spout gently by hand to start the threads. Forcing it can cause cross-threading and damage the parts.
Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.
O-ring is difficult to install and won't seal properly without lubrication.
Solution: The video creator mentions forgetting to add Vaseline to the O-ring seat. This lubricant is highly recommended to ensure an easy installation and a good seal.
Scratched spout finish from pliers.
Solution: Use a rag to protect the spout's finish from being scratched by the pliers.
Be careful when using a razor blade to avoid scratching the tub surround or cutting yourself.
Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.
Mold and water damage occur if non-waterproof caulk is used.
Solution: Choose a caulk that is specifically rated for kitchens and bathrooms as it is waterproof and mold/mildew resistant.
Frequently Asked Questions
How difficult is it to replace a tub spout diverter, and how long should I expect the project to take?
Replacing a tub spout is generally a beginner-friendly plumbing project, as it mostly involves removal and reinstallation. The most time-consuming part can be removing a heavily caulked or corroded old spout. You should budget about 1-2 hours for the entire job, assuming you have the correct replacement parts and tools ready.
Why is it recommended to replace the entire tub spout rather than just repairing the diverter mechanism?
Most tub spout diverters are integrated directly into the spout itself and are not designed for easy disassembly or repair. Attempting to fix the internal mechanism is often more complicated, time-consuming, and less reliable than simply replacing the entire unit with a new one. A new spout guarantees a fresh, fully functional diverter.
What specific tools will I need to successfully remove my old tub spout and install a new one?
You'll primarily need a wrench for threaded spouts or a screwdriver (like the Milwaukee Precision Phillips/Slotted Flat Head Combination Screwdriver Set) for spouts with a set screw underneath. A utility knife (e.g., Husky Pro Utility Knife) is essential for cutting away old caulk, and a caulk gun (JES 1 Qt. 26:1 High-Thrust Caulk Gun) with silicone sealant (GE Tub and Tile Silicone 1 Caulk) is required for sealing the new spout.
How do I ensure I purchase the correct type of replacement tub spout for my existing plumbing?
The most critical step is to determine if your current spout is a 'slip-fit' (secured by a set screw underneath) or 'threaded' (screws directly onto a pipe stub-out). Measure the length of the pipe stub-out from the wall if it's threaded. You can often find universal 'slip fit and IPS connection' models like the DANCO Diverter Tub Spout, which fit both common types. Bringing your old spout or clear photos to the store can also help ensure a correct match.
What are the most common mistakes beginners make when replacing a tub spout, and how can I avoid them?
A common mistake is damaging the pipe stub-out during removal or not properly identifying the spout connection type before purchasing a replacement. Another frequent issue is neglecting to apply a good bead of silicone caulk around the base of the new spout, which can lead to water seeping behind the wall. Always shut off the water before starting to avoid accidental flooding, and double-check your connection type.
What important safety precautions should I take before starting this tub spout replacement project?
Always shut off the main water supply to your house or at least the bathroom before beginning any plumbing work to prevent water damage. Be careful when using a utility knife to remove old caulk, always cutting away from your body. Wearing appropriate eye protection and gloves is also advisable, especially if dealing with old, potentially sharp or corroded parts.