Kohler Bathroom Faucet Replacement Parts: 3 Best Cartridges Compared (2026)

Updated November 2026

If you are looking at kohler bathroom faucet replacement parts, the first decision is usually which component has failed. Most drips, uneven temperature and stiff handles trace back to the valve, so this guide focuses on ceramic valve cartridges for Kohler bathroom faucets. We compare three listings on how clearly they identify the part, whether they cover both the hot and cold sides, how many units you get, and how much owners typically report success with a direct swap. Before you order anything, confirm your faucet model number and whether the handle is a single-lever or a two-handle design, because the valve that fits one body will not fit another.

Our Top Picks

Quick Comparison

Product	Best for	Key feature
KOHLER GENUINE PART GP77005-RP Ceramic Valve (Hot)	Replacing a failed hot-side valve with an original part	Genuine Kohler part number for the hot side
Upgraded Faucet Ceramic Cartridge for Kohler K-GP77005-RP and K-GP77006-RP (2 Pack)	Refreshing both hot and cold sides at once	Two brass-bodied ceramic cartridges in one set
KOHLER GENUINE PART GP77006-RP Ceramic Valve (Cold)	Replacing a failed cold-side valve with an original part	Genuine Kohler part number for the cold side

KOHLER GENUINE PART GP77005-RP Ceramic Valve (Hot)

Best for: Replacing a failed hot-side valve with an original part

This is the choice for homeowners who want a manufacturer-branded component and plan to replace only the hot side. Because it is a genuine Kohler part number, it is the most straightforward reference when you compare against the model number printed on your existing valve.

Key specs

• Part number GP77005-RP, listed as the hot-side ceramic valve
• Designed as a replacement for Kohler bathroom faucet valve assemblies
• Sold as a single valve for the hot side

Pros

• Genuine Kohler part number simplifies matching against your original valve
• Single-side replacement keeps the repair cost of the job focused
• Clear part identification printed on the listing

Cons

• You will need the cold side as well if both valves are worn
• Owners sometimes report the need to confirm the valve orientation before installation

Bottom line: Best for homeowners who know the hot side is the failed component and want an original Kohler part.

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Upgraded Faucet Ceramic Cartridge for Kohler K-GP77005-RP and K-GP77006-RP, 2 Pack

Best for: Refreshing both hot and cold sides at once

This two-pack suits anyone who wants to replace both valves in a single visit, or who is maintaining a faucet where both sides have started to leak or feel stiff. It is listed as compatible with the Kohler part references shown in the title.

Key specs

• Two ceramic valve cartridges in one set (hot and cold)
• Listed compatibility with Kohler K-GP77005-RP and K-GP77006-RP
• Brass construction as described in the listing

Pros

• Covers both sides, so you do not need to reorder mid-repair
• Useful for matching a pair of valves that have worn at similar rates
• Lets you keep a spare on hand for future maintenance

Cons

• Not a genuine Kohler-branded part, so compatibility should be checked carefully against your model
• If only one side has failed, the second cartridge may be unnecessary

Bottom line: A practical choice for a two-side refresh, provided you verify that your faucet uses the referenced part numbers.

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KOHLER GENUINE PART GP77006-RP Ceramic Valve (Cold)

Best for: Replacing a failed cold-side valve with an original part

This is the cold-side counterpart to the hot valve above. It suits owners who have isolated a cold-side leak or a cold-only stiffness problem and want a genuine Kohler reference rather than an aftermarket cartridge.

Key specs

• Part number GP77006-RP, listed as the cold-side ceramic valve
• Sold as a single valve for the cold side
• Designed for Kohler bathroom faucet valve assemblies

Pros

• Genuine Kohler part number makes cross-checking straightforward
• Pairs logically with the hot-side part when both need replacing
• Clearly labeled as cold side, reducing ordering mistakes

Cons

• Requires a separate order if the hot side also needs work
• Owners sometimes report that matching the valve to the correct handle position takes extra care

Bottom line: Ideal for a single cold-side failure where an original Kohler part is preferred.

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Buying Guide

Identify the correct part number

Kohler valves are identified by part numbers stamped or printed on the valve body or packaging. Remove the handle and look at the valve before ordering. Matching the number exactly is the most reliable way to avoid a wrong-fit purchase.

Good picks for this: KOHLER GENUINE PART GP77005-RP Ceramic Valve (Hot), KOHLER GENUINE PART GP77006-RP Ceramic Valve (Cold)

Hot-side versus cold-side valves

Hot and cold valves are not always interchangeable. Confirm which side is failing by turning off the water supply, removing the handle and checking which valve shows wear, mineral buildup or leakage. Ordering the matching side avoids a second trip.

Good picks for this: KOHLER GENUINE PART GP77005-RP Ceramic Valve (Hot), KOHLER GENUINE PART GP77006-RP Ceramic Valve (Cold)

Single-part versus two-part sets

If both valves are the same age, replacing them together often gives more even temperature control. A two-pack can simplify the job, but it adds cost to a repair that only needs one part, so weigh the wear on each side before buying.

Good picks for this: Upgraded Faucet Ceramic Cartridge (2 Pack), KOHLER GENUINE PART GP77006-RP Ceramic Valve (Cold)

Material and construction

Brass bodies and ceramic discs are the common construction for modern cartridges. Ceramic disc valves are widely used because they resist wear better than rubber washers. Check the listing for the material description and confirm it matches your existing valve.

Good picks for this: Upgraded Faucet Ceramic Cartridge (2 Pack), KOHLER GENUINE PART GP77005-RP Ceramic Valve (Hot)

Compatibility with your faucet model

Kohler uses different valve designs across bathroom faucet lines. Before buying, compare the part number to your model documentation or the number on the old valve. A part labeled for one series may not seat correctly in another.

Good picks for this: KOHLER GENUINE PART GP77005-RP Ceramic Valve (Hot), Upgraded Faucet Ceramic Cartridge (2 Pack)

Water pressure and supply

Replacement valves will not fix low water pressure caused by a clogged aerator, a partially closed supply valve or sediment in the line. Check these before ordering a cartridge, so you do not replace a part that was never the problem.

Good picks for this: KOHLER GENUINE PART GP77006-RP Ceramic Valve (Cold), KOHLER GENUINE PART GP77005-RP Ceramic Valve (Hot)

Care and maintenance

Mineral deposits shorten valve life. Periodically cleaning aerators and checking for drips at the handle can extend the life of a new cartridge. Keep a note of the installation date so you can track how long each valve lasts.

Good picks for this: Upgraded Faucet Ceramic Cartridge (2 Pack), KOHLER GENUINE PART GP77006-RP Ceramic Valve (Cold)

FAQ

How do I know which Kohler part I need?

Turn off the water supply, remove the handle and read the part number on the valve body. Match that number to the listing. If the number is unclear, take a photo of the valve and compare it to your faucet model documentation before ordering.

Can I replace only one valve?

Yes, if only one side is failing. Replacing a single cartridge is common. However, if both valves are the same age and show wear, replacing them together can produce more consistent temperature control.

Do I need a plumber to install a replacement valve?

Many homeowners handle this with basic hand tools, but an unfamiliar install can lead to leaks or damage to the valve body. If you are unsure about shutting off supply lines or the faucet design, consult a licensed plumber.

Why is my faucet still dripping after replacing the valve?

Possible causes include a mismatched part, debris trapped in the valve seat, a worn seal elsewhere or a valve that was not fully seated. Recheck the part number, clean the seat area and confirm the valve is installed in the correct orientation.

Are genuine Kohler parts better than aftermarket cartridges?

Genuine parts carry the manufacturer’s part number, which simplifies matching. Aftermarket cartridges can work well when they list compatibility with your exact model, but you should verify fit carefully before installing.

How often should a bathroom faucet valve be replaced?

Service life depends on water hardness, usage and maintenance. There is no fixed schedule. Replace the valve when you see persistent dripping, stiff handles, or uneven temperature that cleaning does not resolve.

What tools do I need for a valve swap?

Most jobs require an adjustable wrench, a handle puller or screwdriver depending on the handle style, plumber’s grease and a towel to protect the finish. Have the new part on hand before you shut off the water.

Conclusion

For a single failed hot side, the KOHLER GENUINE PART GP77005-RP is the most direct choice, and the GP77006-RP fits the same logic for the cold side. If both sides need attention, the two-pack cartridge set offers convenience, provided you confirm compatibility with your model. In every case, match the part number before you order and check water pressure and aerators first.

Sources

• Guidance on household water use and fixture efficiency that can help you diagnose leaks and conservation issues (epa.gov)
• Information on certified plumbing products and standards for drinking water components (nsf.org)
• Plumbing code and product standards relevant to valve and faucet installation

Related reading

• Price Pfister Bathroom Faucet Replacement Parts Review (2026)
• Pfister Bathroom Faucet Parts: 3 Best Replacements Compared (2026)
• Moen Bathroom Faucet Replacement Parts: Identify, Order and Swap Them (2026)
• Kohler Bathroom Faucet Parts: Identify, Order and Replace the Right Ones

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