Description
GP77759 Mixer Balance Cap Stem — Kohler Rite-Temp Replacement
The iFJF GP77759 mixer balance cap stem is a precision-machined replacement for worn or leaking Kohler Rite-Temp valve stems. When water starts seeping from around your shower handle or the temperature adjustment becomes imprecise, this component is often the root cause. Direct drop-in replacement — no modifications needed.
Key Features
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Precision-Machined Brass Stem: Corrosion-resistant brass construction for decades of reliable service
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OEM-Spec Fit: Identical dimensions to Kohler GP77759 for seamless installation
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Complete Stem Assembly: Includes stem, O-rings, and seals — ready to install
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Smooth Temperature Control: Restores precise hot/cold mixing at the handle
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Leak-Free Seal: Fresh O-rings eliminate handle-area water seepage
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DIY Installation: Replaces in 10–15 minutes with basic hand tools
Compatibility
| Brand |
Valve Series |
Size |
| Kohler |
Rite-Temp K-304 |
1/2" |
| Kohler |
Rite-Temp K-8300 Series |
1/2" |
Specifications
| Specification |
Value |
| Part Number |
GP77759 |
| Stem Material |
Brass |
| Valve Compatibility |
K-304, K-8300 Series |
| Connection |
1/2" |
| Includes |
Stem, O-rings, seals |
Signs You Need a New GP77759
- Water dripping from behind the shower handle
- Temperature dial feels loose or doesn't stay in position
- Difficulty finding the right water temperature mix
- Visible corrosion or mineral buildup on the existing stem
- Handle spins freely without changing water temperature
Installation Steps
- Turn off water supply to shower valve
- Remove the shower handle (typically a set screw underneath)
- Remove the trim/escutcheon plate
- Unscrew and remove the old GP77759 stem using an adjustable wrench
- Clean the valve body threads and seating surface
- Apply plumber's grease to the new stem O-rings
- Thread the new GP77759 stem into the valve body — hand-tighten first, then 1/4 turn with wrench
- Reassemble the trim plate and handle
- Turn water back on and test for leaks and smooth operation
Frequently Asked Questions
Q: Is this just the cap/stem, or does it include the cartridge too?
A: This is the GP77759 mixer balance cap stem only. For a complete rebuild including the pressure balancing cartridge, see our GP76851 combo kit.
Q: Will this fit my K-8304 shower valve?
A: Yes, the GP77759 fits all Kohler Rite-Temp K-304 and K-8300 series 1/2" pressure balance valves.
Q: Can I replace just the O-rings instead of the whole stem?
A: While possible, the brass stem itself wears over time. Given the low cost of this complete assembly, replacing the entire stem ensures a reliable, long-lasting fix.
Q: How tight should I install the new stem?
A: Hand-tighten until snug, then add no more than 1/4 turn with a wrench. Overtightening can crack the valve body or strip the threads.
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