Kohler Gp75878 How To Replace – Guide
To replace your Kohler GP75878 diverter, first turn off the water supply and gather necessary tools. Remove the plug button, handle, bonnet, and pull the spout straight up.
Use needle nose pliers to pull the old diverter assembly out, then insert the new one aligning fins outward. Reinstall the retainer clip, spout, bonnet, handle, and plug button securely.
Finally, restore water and test for leaks. For a complete walkthrough, you’ll find detailed steps and tips ahead.
Turn Off Water and Prepare for Kohler GP75878 Replacement

Before you begin replacing the Kohler GP75878 diverter assembly, turn off the water supply to prevent leaks.
Locate the shutoff valves under the sink and turn off the water completely.
Next, prepare for replacement by gathering necessary tools: a hex wrench, needle nose pliers, and a container to catch residual water.
Work in a well-lit area to guarantee clear visibility of all components and avoid losing small parts.
Familiarize yourself with the faucet’s elements, including the plug button, handle, bonnet, and diverter assembly, so you can proceed efficiently.
Once you remove the old parts, apply a silicone-based lubricant to the new seals to confirm proper sealing and functionality.
Apply silicone-based lubricant to new seals after removing old parts for optimal sealing and function.
Taking these preparatory steps will streamline your Kohler GP75878 replacement process.
Remove Handle, Bonnet, and Spout From Your Kohler GP75878
With the water supply turned off and your tools ready, start by removing the plug button from the back of the handle to access the set screw.
Use a hex wrench to loosen the set screw, then carefully remove the handle.
Next, unscrew the bonnet by turning it counterclockwise to expose the valve and mounting nut beneath.
Once the bonnet is off, pull the spout straight up to detach it from the faucet body.
Check the underside of the spout for any additional components, such as retainer clips or screws, and remove them if necessary for full access.
Removing the handle, bonnet, and spout properly guarantees you can proceed safely with further faucet disassembly or replacement steps.
Remove the Old Kohler GP75878 Diverter Assembly

Use needle nose pliers to firmly grip the fins of the old Kohler GP75878 diverter assembly located at the back of the faucet body. Verify that your workspace is well-lit and clear before you carefully pull the diverter assembly straight out of its slot in the valve body.
Inspect the removed diverter assembly for wear or blockage to determine the cause of malfunction. Avoid damaging nearby parts to guarantee a smooth replacement process. After removal, dispose of the old diverter assembly properly if you’re not reusing it.
| Step | Action |
|---|---|
| 1 | Grip fins with needle nose pliers |
| 2 | Verify clear, well-lit workspace |
| 3 | Pull diverter straight from valve body |
| 4 | Inspect for wear or blockage |
| 5 | Dispose old diverter safely |
Install the New Diverter and Retainer Clip Properly
Insert the new diverter assembly into the valve body, making certain the fins face outward for correct operation. During installation, align the diverter properly to guarantee smooth function.
Next, use snap ring or needle nose pliers to securely reinstall the silver-colored retainer clip, which holds the diverter firmly in place. Check that the retainer clip is neither bent nor damaged; replace it if necessary to maintain assembly integrity.
Carefully reinstall the silver retainer clip with pliers, ensuring it is undamaged and securely holds the diverter.
This step is critical for preventing leaks or malfunctions. As plumbers often emphasize, precise alignment and secure fastening guarantee top performance. Follow this guide carefully to avoid misalignment issues.
Once the diverter and retainer clip are installed securely, you’re ready for the next steps in your Kohler GP75878 replacement process.
Reassemble the Faucet and Test Its Operation

After replacing the diverter, slide the spout firmly back onto the faucet body to guarantee a secure fit.
To reassemble the faucet, follow these steps carefully:
- Twist the bonnet clockwise onto the faucet body to seal internal components.
- Reinstall the handle, then tighten the set screw underneath to secure it.
- Snap the plug button into place at the back of the handle to restore appearance.
- Turn on the water supply and test the faucet thoroughly for leaks or operational issues.
Completing these steps assures the diverter and faucet components are properly reassembled.
Testing the faucet confirms the repair’s success and helps prevent future malfunctions.
Frequently Asked Questions
What Tools Are Best for Maintaining My Kohler GP75878 Faucet?
You’ll need a 5/32-inch hex wrench to loosen screws and secure parts.
Use needle nose pliers for delicate tasks like removing the diverter assembly or retainer clip without damage.
Snap ring pliers help safely handle retainer clips.
Keep silicone-based lubricant handy to maintain seals and o-rings for smooth operation.
Finally, use a container to catch residual water and keep your workspace clean during maintenance.
How Often Should I Replace Seals in the Kohler GP75878?
You should replace the seals every 2 to 5 years because who doesn’t want a surprise indoor waterfall?
Check seals regularly for wear, especially if you notice dripping or reduced water pressure.
Hard water speeds up seal wear, so replace them more often in those areas.
Always use manufacturer-approved seals to guarantee proper fit and avoid leaks.
Staying proactive keeps your faucet running smoothly without unexpected floods.
Can I Use Generic Parts With the Kohler GP75878 Faucet?
You shouldn’t use generic parts with your Kohler GP75878 faucet. Kohler designs their components for precise compatibility, ensuring ideal function and durability.
Generic parts often don’t match the quality or specifications, which can risk leaks or malfunctions. To keep your faucet working well and protect your warranty, always use genuine Kohler replacement parts.
If you’re thinking about generic options, make sure to check compatibility carefully. This helps avoid damaging your faucet or voiding your warranty.
What Causes Leaks in the Kohler GP75878 Faucet?
About 70% of faucet leaks stem from worn seals and o-rings.
In your Kohler GP75878, leaks usually happen because these seals degrade over time or the diverter assembly gets obstructed.
Corrosion and mineral buildup can also prevent tight fittings, causing water to seep out.
Moreover, loose mounting nuts or a failing cartridge contribute to leaks.
Regularly inspect and replace these parts to keep your faucet leak-free.
How Do I Troubleshoot Low Water Pressure in My Kohler GP75878?
Start by checking if the aerator or faucet screen is clogged and clean it if necessary.
Inspect supply lines for kinks, leaks, or blockages. Make sure the water supply valves are fully open.
Examine the diverter assembly for wear or obstructions.
Finally, flush your plumbing by running other faucets to clear sediment buildup.
These steps will help you identify and resolve low water pressure issues efficiently.
Conclusion
Replacing your Kohler GP75878 diverter might seem tricky, but like tuning a fine instrument, each precise adjustment brings harmony back to your faucet. Remember, 90% of leaks stem from worn diverters, so your careful work here prevents future drips.
By following these steps: turning off water, removing old parts, installing the new diverter, and testing, you guarantee smooth operation. With patience and attention, your faucet will function flawlessly, saving water and headaches.