---
title: "How To Install Kohler Flush Valve Kit 85406 – Quick Guide"
id: "1363"
type: "post"
slug: "how-to-install-kohler-flush-valve-kit-85406"
published_at: "2026-10-07T05:20:49+00:00"
modified_at: "2026-09-28T04:35:16+00:00"
url: "https://rvcloudcocampbell.com/how-to-install-kohler-flush-valve-kit-85406/"
markdown_url: "https://rvcloudcocampbell.com/how-to-install-kohler-flush-valve-kit-85406.md"
excerpt: "Begin your Kohler flush valve installation confidently with our quick guide, ensuring a leak-free setup and smooth operation every time."
taxonomy_category:
  - "Kohler Toilets"
---

![install kohler flush valve](https://rvcloudcocampbell.com/wp-content/uploads-webpc/uploads/2026/09/install_kohler_flush_valve_uwf3t.jpg.webp)

First, turn off the **water supply** and drain your toilet tank. Remove the tank lid and old **flush valve**, then clean the mounting surface.

Apply dish soap to the new Kohler flush valve gasket and secure it tightly with the retaining nut. Reconnect the water supply and slowly refill the tank, checking for leaks.

Test the flush valve, adjusting its height for **maximum flow** and performance. Follow these steps, and you’ll guarantee a reliable installation with smooth operation.

## Gather Tools and Prepare Your Work Area

Start by gathering **essential tools** like a wrench, screwdriver, adjustable pliers, and a towel to guarantee a **smooth installation** of the **Kohler Flush Valve Kit 85406**.

Set up your work area in a **clean, spacious spot**, ideally near a bathtub or shower, so you can place the toilet tank lid safely.

> Choose a clean, spacious area near a bathtub or shower to safely set aside the toilet tank lid.

Lay a towel around the toilet base to catch any residual water during tubing or valve disconnections.

Before beginning, familiarize yourself with all flush valve kit components and carefully review the **installation instructions**, including any diagrams.

This preparation will help you work efficiently and avoid unnecessary interruptions.

Keeping tools at hand and your workspace organized ensures a practical, streamlined installation process.

## Turn Off Water Supply and Drain the Toilet Tank

First, find the **water supply valve** behind your toilet and turn it clockwise to shut off the water flow.

Once that’s done, go ahead and **flush the toilet** to drain most of the water from the tank. Be sure to hold down the handle so any leftover water can drain out before you move on.

### Locate Water Supply Valve

Locate the **water supply valve** behind or near the base of your toilet and **turn it clockwise** to shut off the water flow completely. This valve is usually mounted on the wall or floor close to the toilet.

Once the valve is fully closed, **flush the toilet** to drain most of the water from the tank. This step minimizes water spillage during the flush valve kit installation.

After flushing, check the tank for any **residual water**. Use a towel to absorb and remove any remaining moisture inside the tank to maintain a **dry workspace**.

Ensuring the tank is as empty as possible helps prevent leaks or messes when you start removing the old flush valve components.

Confirm the valve is tightly closed before proceeding to the next step.

### Shut Off Water Flow

With the water supply valve fully closed as previously described, you’ll want to flush the toilet to empty the tank. Hold the handle down to guarantee the tank drains completely, preventing water from interfering with the installation.

Use towels or a sponge to soak up any residual water. Inspect the tank’s interior for buildup or residue and clean as necessary before proceeding.

| Step | Action | Tip |
| --- | --- | --- |
| 1 | Turn water supply valve clockwise | Located behind the toilet |
| 2 | Flush toilet, hold handle down | Empties tank fully |
| 3 | Remove remaining water | Use sponge or towels |
| 4 | Inspect and clean tank | Avoid installation issues |

### Flush And Drain Tank

Begin by turning the **water supply valve** behind the toilet clockwise to shut off the flow completely.

Next, **flush the toilet** to drain the tank fully, removing most of the water. This step prevents spills during the flush valve replacement.

After flushing, use a sponge or towel to soak up any residual water at the tank’s bottom. This guarantees a **dry workspace** for efficient installation.

Carefully remove the **tank lid** and place it on a flat surface, like a towel inside a bathtub or shower, to avoid damage.

Confirm the flush valve kit matches your toilet model since installation differs between one- and two-piece designs.

With the tank empty and dry, you’re ready to proceed with installing the **Kohler Flush Valve Kit 85406**.

## Remove the Old Kohler Flush Valve Kit 85406

First, go ahead and **turn off the water supply**, then flush the toilet to get the tank completely drained.

Carefully lift the tank lid off and set it aside. Next, **disconnect the water supply line**, making sure to protect the area around it from any leftover water that might spill out.

After that, you’ll want to unscrew the tank bolts and carefully lift the tank off the bowl.

Finally, remove the retaining nut to take out the **old flush valve kit**.

### Preparing Toilet For Removal

Remove the tank lid carefully and set it on a towel in a bathtub or shower to prevent damage.

Next, **turn off the water supply** to the toilet. **Flush the toilet** to drain the tank completely, ensuring no water remains.

Wrap a towel around the toilet bowl to catch any spills, then **disconnect the water supply line** from the tank.

Remove the tank bolts to detach the tank from the bowl.

Lift the tank off carefully and place it on its side to access the flush valve.

Finally, remove the nut at the bottom center of the tank to prepare for removing the old Kohler flush valve kit 85406.

Keep track of the assembly order for a smooth reinstallation later.

### Detaching Flush Valve Kit

With the tank set on its side and the nut at the bottom center loosened, you can now detach the old Kohler flush valve kit 85406. First, turn off the water supply and flush to drain the tank.

Remove the tank lid carefully and disconnect the water supply line. Use a wrench to remove the tank bolts, lift the tank off the bowl, and place it on its side. Loosen the nut at the bottom center to detach the flush valve.

Clean any gasket residue from the tank opening to achieve a proper seal with the new kit.

| Step | Action |
| --- | --- |
| 1 | Turn off water supply |
| 2 | Flush and drain tank |
| 3 | Remove tank lid and bolts |
| 4 | Lift tank and loosen nut |
| 5 | Detach flush valve and clean |

## Clean and Check Tank Surface for a Proper Seal

Thoroughly clean the tank surface to eliminate debris and old sealant that could prevent a proper seal. Use a scraper or cloth to remove residues, making certain the area is smooth and free of buildup.

Inspect the tank’s rim and base carefully for cracks or irregularities that might cause leaks later.

Dry the surface completely before proceeding; moisture can interfere with the gasket’s adhesion.

Verify the tank’s alignment with the bowl to guarantee even pressure distribution on the gasket, which is essential for a **watertight seal**. Address any misalignment before installation.

Completing these steps guarantees the flush valve kit seats correctly, **preventing leaks**.

## Install the New Kohler Flush Valve Kit 85406

Start by turning off the **water supply** and flushing the toilet to drain the tank completely, guaranteeing you can access all internal components.

Remove the tank lid carefully and set it on a soft surface to avoid damage.

Detach the **flush valve retaining mechanism** according to your toilet’s design.

> Carefully remove the flush valve retaining mechanism following your toilet’s specific design requirements.

Apply **dish soap** to the gasket on the new Kohler Flush Valve Kit 85406 to secure a proper seal.

Position the **gasketed valve base** securely in the tank and fasten it firmly.

Reconnect the trip lever chain, confirming all connections are tight and aligned correctly.

At this stage, verify that the valve sits flush and is positioned to function smoothly.

This precise installation step is essential for **leak prevention** and peak flush performance.

## Secure the Valve and Reconnect the Water Supply

Tighten the **flush valve retaining mechanism** securely, following the manufacturer’s guidelines to ensure a firm seal. This guarantees the valve stays firmly in place and prevents leaks.

Next, **reconnect the water supply line** to the tank. **Hand-tighten the connection** initially to avoid cross-threading, then use a wrench for added security if needed.

Before turning the water back on, **double-check all connections** and the valve’s alignment for proper fit and any visible gaps or potential leak points.

Slowly **restore water flow** to allow the tank to refill gradually.

Monitor the connections carefully during this process to catch any leaks early. Proper securing and reconnection set a solid foundation for reliable flush valve performance and durability.

## Test the Flush Valve for Leaks and Proper Function

Once you turn the **water supply** back on, flush the toilet to **check for leaks** around the valve and its connections.

Carefully inspect the base of the flush valve and the surrounding seals for any signs of moisture or drips.

Observe the tank’s **water level**; it should refill to the proper height without overflowing or holding excess water. This verifies a secure seal and correct valve operation.

Listen closely for **unusual sounds** like continuous running water, which may indicate a faulty gasket or improper installation.

Finally, monitor the **flush performance** to make sure it clears the bowl effectively in one flush. If you notice repeated flushing or water loss, reassess the installation for potential issues before proceeding.

## Adjust Flush Valve Height for Optimal Flushing Performance

Make certain the Kohler flush valve height aligns precisely with the overflow tube to optimize flushing performance. Adjust the height by rotating the adjustment collar or repositioning the valve base, confirming you don’t exceed maximum height limits.

Proper alignment prevents weak flushing and trap seal failure, which can cause sewer gas odors and reduce efficiency. After adjusting, check the trip lever chain alignment for smooth operation.

Test flushing regularly to maintain system longevity.

| Adjustment Step | Action | Purpose |
| --- | --- | --- |
| Height Alignment | Align valve top with overflow tube | Optimize flush volume |
| Collar Rotation | Rotate collar clockwise or counterclockwise | Fine-tune valve height |
| Base Positioning | Reposition valve base if needed | Avoid exceeding max height |
| Chain Verification | Confirm trip lever chain is slack but responsive | Smooth flush activation |

## Frequently Asked Questions

### Can I Install This Kit Without Professional Plumbing Experience?

Yes, you can install the Kohler Flush Valve Kit 85406 without professional plumbing experience. The kit is designed for **easy installation**, and with basic tools like a wrench and towel, you can follow the **step-by-step instructions**.

Make sure to read the guide carefully, work methodically, and double-check fittings to avoid leaks.

If you run into issues, **troubleshooting tips** and regular maintenance will help you maintain proper function.

### Is the Kohler Flush Valve Kit 85406 Compatible With All Toilet Models?

No, the **Kohler Flush Valve Kit 85406** isn’t compatible with all toilet models.

It’s specifically designed for certain Kohler one- and two-piece toilets with canister-style flush valves.

You’ll need to verify your toilet model matches Kohler’s specifications before purchasing.

Using it on other brands or older Kohler designs may cause fitting issues or malfunction.

Always check **compatibility** or consult Kohler support to guarantee a proper fit and **reliable performance**.

### How Often Should I Replace the Flush Valve Kit?

Think of your **flush valve kit** like the heart of your toilet’s flushing system. It needs replacing every 5 to 10 years to keep things flowing smoothly.

If you notice **weak flushes** or leaks, don’t wait; swap it out sooner. Hard water can speed up wear, so inspect regularly.

Always follow your toilet’s **manufacturer guidelines** to guarantee peak performance and avoid costly damage. Regular checks extend your kit’s lifespan effectively.

### What Tools Are Recommended but Not Included in the Kit?

You’ll need an **adjustable wrench** to tighten nuts and bolts, a flathead screwdriver for prying old parts, and pliers to loosen stubborn fittings.

A **basin wrench** helps reach tight spots inside the tank.

Keep a towel handy for spills and use dish soap to ease gasket installation and guarantee a good seal.

These tools aren’t included but are essential for a **smooth, secure flush valve replacement**.

### Are There Any Warranty or Support Options Available for This Kit?

Yes, your Kohler Flush Valve Kit 85406 comes with a **limited one-year warranty** covering material or workmanship defects.

You can access support through Kohler’s website, including **installation guides**, FAQs, and forums.

Phone support is available to speak with trained representatives.

Register your product online to keep track of **warranty status** and receive updates. This guarantees you get timely help and maintain your kit’s performance effectively.

## Conclusion

By installing the **Kohler flush valve kit 85406** yourself, you can save up to 30% on **water usage** compared to older models. This upgrade not only improves flushing efficiency but also helps reduce your water bill and environmental impact.

Following these clear steps guarantees a secure fit and **leak-free operation**. With proper installation and adjustment, you’ll enjoy peak performance and long-lasting reliability in your toilet system.

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