1. Introduction
This instruction manual provides detailed guidance for the installation, operation, and maintenance of the TycoonWon GP77886 Mixer Cap Assembly. This product is designed as a replacement part for Kohler K-15701-K and K-15700-K mixing valves. Please read this manual thoroughly before installation to ensure correct procedure and optimal performance.
2. Safety Information
Always observe the following safety precautions during installation and maintenance:
- Turn off water supply: Before beginning any work, ensure the main water supply to the fixture is completely shut off to prevent water damage.
- Wear protective gear: Use appropriate personal protective equipment, such as safety glasses and gloves.
- Professional assistance: If you are unsure about any step, consult a qualified plumber.
- Inspect components: Before installation, inspect all parts for any damage or defects. Do not install damaged components.
3. Package Contents
The TycoonWon GP77886 Mixer Cap Assembly package includes the following items:
- 1 x GP77886 Mixer Cap Assembly
- 2 x Mounting Screws
- 2 x Washers
- O-rings (pre-installed or separate, ensure all are present)

Figure 3.1: GP77886 Mixer Cap Assembly with included screws and O-rings.

Figure 3.2: Side view of the GP77886 Mixer Cap Assembly, showing the brass stem and plastic housing.
4. Setup & Installation
Follow these steps to properly install the GP77886 Mixer Cap Assembly:
- Prepare the Valve Body:
Before installing the new mixer cap assembly, thoroughly clean the existing valve body. Remove any debris, mineral deposits, or burrs that may be present. A clean valve body is crucial for proper sealing and function.
- Install O-rings:
Ensure that the O-rings are correctly seated in their grooves on the mixer cap assembly. Proper placement of the O-rings is essential to prevent leaks. If O-rings are provided separately, carefully install them onto the assembly before proceeding.

Figure 4.1: Ensure O-rings are properly seated on the assembly.
- Position the Assembly:
Carefully align the GP77886 Mixer Cap Assembly with the valve body. The square brass stem should fit into the corresponding opening in the valve.

Figure 4.2: Top view of the assembly, highlighting the square brass stem.
- Secure with Screws:
Insert the two provided mounting screws through the washers and into the designated holes on the mixer cap assembly. Tighten the screws evenly and securely, but do not overtighten, as this can damage the assembly or valve body.
- Test for Leaks:
Once the assembly is secured, slowly turn the main water supply back on. Check for any leaks around the newly installed mixer cap assembly. If leaks are detected, turn off the water supply, re-check O-ring placement, and ensure screws are tightened appropriately.
5. Operating Instructions
The GP77886 Mixer Cap Assembly facilitates the smooth rotation of your faucet handle, allowing for precise control of water temperature and flow. Once installed, operate your faucet as usual. The square brass stem is designed for durable and consistent performance.
6. Maintenance
Regular maintenance helps prolong the life and efficiency of your mixer cap assembly:
- Periodic Inspection: Periodically check for any signs of leakage or reduced performance.
- Cleaning: If water flow becomes restricted or erratic, it may indicate mineral buildup. Turn off the water supply and carefully remove the assembly to clean any debris or mineral deposits from the valve body and the assembly itself.
- O-ring Replacement: Over time, O-rings can wear out or become brittle, leading to leaks. If leaks persist after re-tightening, consider replacing the O-rings with new ones of the correct size.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Water leakage around the assembly |
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| Difficulty turning faucet handle |
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| Water not shutting off completely |
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8. Specifications
- Model: GP77886 Mixer Cap Assembly
- Compatibility: Kohler K-15701-K, Kohler K-15700-K Mixing Valves
- Material: Brass stem, durable plastic housing
- Includes: Mixer Cap Assembly, 2 Screws, 2 Washers, O-rings
- Manufacturer: TycoonWon
9. Warranty & Support
For warranty information or technical support regarding your TycoonWon GP77886 Mixer Cap Assembly, please refer to the seller's policy or contact TycoonWon customer service directly. Keep your purchase receipt for warranty claims.
For further assistance, please visit the TycoonWon Store on Amazon.