---
product_id: 8526420
title: "Silent Fill Toilet Valve Kit, Genuine Part GP1138930, Adjustable with Multiple Fill-Rate Inserts"
brand: "kohler"
price: "8970 som"
currency: KGS
in_stock: true
reviews_count: 13
category: "Kohler"
url: https://www.desertcart.kg/products/8526420-silent-fill-toilet-valve-kit-genuine-part-gp1138930-adjustable-multiple
store_origin: KG
region: Kyrgyzstan
---

# Silent Fill Tech Adjustable Fill-Rate Inserts Easy DIY Install Silent Fill Toilet Valve Kit, Genuine Part GP1138930, Adjustable with Multiple Fill-Rate Inserts

**Brand:** kohler
**Price:** 8970 som
**Availability:** ✅ In Stock

## Summary

> 🚽 Upgrade your flush game with silent precision and smart water control!

## Quick Answers

- **What is this?** Silent Fill Toilet Valve Kit, Genuine Part GP1138930, Adjustable with Multiple Fill-Rate Inserts by kohler
- **How much does it cost?** 8970 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/8526420-silent-fill-toilet-valve-kit-genuine-part-gp1138930-adjustable-multiple)

## Best For

- kohler enthusiasts

## Why This Product

- Trusted kohler brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Universal Kohler Fit:** Designed specifically for Kohler Class 5 toilets, ensuring seamless compatibility and hassle-free replacement.
- • **Whisper-Quiet Refill:** Experience near-silent tank filling that keeps your home peaceful without sacrificing performance.
- • **Customizable Water Flow:** Multiple color-coded inserts let you optimize water usage for eco-friendly efficiency or powerful flushes.
- • **Tool-Friendly Installation:** Adjustable length and simple float screw make installation and fine-tuning a breeze—even for non-plumbers.
- • **Durability That Lasts Decades:** Built to Kohler’s exacting standards, this valve promises longevity that can outlast your last home upgrade.

## Overview

The KOHLER Silent Fill Toilet Valve Kit (GP1138930) is a genuine OEM replacement part engineered for Kohler Class 5 toilets. Featuring silent fill technology, adjustable fill-rate inserts, and an extendable valve stem, it offers easy installation and customizable water flow to optimize performance and conserve water. Trusted for durability, this valve ensures long-lasting, leak-free operation with a professional fit and finish.

## Description

Product Description Protect the warranty on KOHLER products, always look for the KOHLER GENUINE PARTS logo. KOHLER GENUINE PARTS are designed by KOHLER engineers to maintain original product performance and promote product longevity. From the Manufacturer Kohler Genuine Part, Fill Valve, For most Kohler toilets.

Review: Nearly identical to 25 year old Kohler valve, easy to install even for a plumb-tard if you can Google and have slip joint pliers - My original Kohler GP1138930/400a lasted nearly 25 years - amazing longevity. I knew it was dying a slow death when I would hear it fill by itself at night and running long after flushing. I ordered this new valve from desertcart about a week ago. The valve finally quit last night and I shut the water to the toilet off and fixed it today. When I removed the 25 year old fill valve today and compared it to the new one, it was nearly a dead ringer. The major change that jumped out was that the former valve had a metal float adjustment rod had been changed to a threaded plastic screw rod which is actually far easier to adjust than the previous version. One thing to know is that this new valve is expandable in length to almost 14" from the inside of the tank to the valve top simply by twisting the threaded gray valve stem. It was exactly the same setup on the 25 year old valve and I just matched the length because there are 1" increments on the gray stem up to 13" and the original was set at 13". So take note of those little details if you are replacing the same valve and save some time and aggravation The new valve comes with a variety of color coded water restrictors that go on the output hose. The original valve didn't have any of these restrictors in place so I didn't use them and the valve worked great but your situation may vary. There are some helpful installation videos on YouTube if you Google "replace Kohler 400a toilet tank valve" and go to videos. I'm very handy around the house and was a diesel and auto mechanic decades ago after college to bank some $$ prior to going back to college for pharmacy school. I can fix almost anything but plumbing always seems to be my Achilles heel, even as a diesel mechanic - hydraulic lines can be a real pain. In home plumbing, there's always a leak, a missing part, some tool I don't have, something I over tighten and break or under tighten and it leaks or the inevitable hardware store trip(s). The new valve was simple to install, didn't leak, required very common hand tools and I only made one trip to the hardware store for a new 12" stainless supply line. If I'm changing the valve, I may as well change the supply line as well, The new Kohler valve is simple to adjust for fluid flow, shutoff height and actual installation. As I mentioned, plumbing never seems to go well for me despite the fact that I can wire outlets and ground faults, light fixtures, AC units and hot tubs, install drywall, do flawless custom finish/trim work and install any sort of interior door. But my plumbing skills simply suck. So this valve MUST be easy to install if a plumb-tard like me can get it done in under an hour. I realize some folks have zero ability in this area and that's plumbers make 6 figures a year because they earn it by being really good at work that annoys others to death. If you are one of those folks, dial up your local plumber and be ready to donate $100 - $150+ for this repair. I just ordered two more of these valves, new USA made 12" stainless flex water lines and new Kohler flush handles from desertcart for my other two toilets in the same house. If one valve died after nearly 25 years, the other two have to be close to failure as well so I may as well change them all out after beating the learning curve, while my plumbing luck holds out and before the other old ones crap out - pun intended. Photos: I added some photos. The left hand photo shows the my 25 year old Kohler/Fluidmaster 400a next to the new one from desertcart. The new one has been extended by holding the gray stem and twisting the black stem to it's max length for my installation - yours may vary. The middle photo shows the removal of the small blue metering jet from the new valve. My original valve had no metering jet installed and I followed suit. Again, your situation may vary. The far right photo shows one of the weak points of the new valve. The black tube is new and is included in the kit along with the little metal squiggle annotated by the red arrow. That metal squiggle is supposed to hold the fill hose in the plastic fill pipe in the toilet tank. The old fill tube hardware annotated by the yellow arrow is the original set up that I cleaned up with CLR and reinstalled. The new metal squiggle just didn't work for me and could be a 1 star deduction in some customers eyes. New isn't always better.
Review: Perfect replacement, no leaks, worked right out of the box! - Gets the job done, fits perfectly, works perfectly. Is NOT silent, but also isn’t extremely noisy, but you’ll definitely hear the water flowing through the fill valve, I mean that’s just physics of water flowing through a device. It can’t be completely quite unless you want it to take forever to fill the bowl! Be realistic on your expectations of quiet vs silent water fill valves. The point is that it works, it does not leak, and it’s very easy to install and adjust. There’s really only two adjustments to make. The obvious one is the screw that moves the float up or down. Move the float up, shorten the screw length, if you want to raise the water level (the valve will cut off at a higher water level). Move the float down, extend the length of the screw, if you want to lower the water level (the valve will cut off at a lower water level). The other adjustment is the tiny plastic color-coded piece that you install before making the bowl fill extension pipe connection. Various colors indicate flow rates, higher flow rates fill the bowl with more water during each flush, lower flow rates do the opposite. Don’t bother adjusting for this until you have the water level and especially the flush valve setup for a perfect flush. Then it’s just a matter of gauging whether or not the bowl is filling with enough water and adjusting the flow rate by installing a different plastic piece if you need to. Better to slightly overfill than underfill, want to make sure you have a full bowl of water.

## Features

- Silent Fill Technology: Provides a gracious experience by filling the tank quietly
- Adjustable with Multiple Fill-rate Inserts: Are provided to optimize performance and conserve water
- Compatibility: Compatible with Kohler Class 5 toilets; confirm shank color to determine correct part; If grey, use this part and if black, use GP1083167
- Please note: Cap color may vary. Never use an abrasive material such as a brush or scouring pad to clean surfaces

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003MH314U |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #5,431 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #6 in Toilet Flush Valves |
| Brand | Kohler |
| Color | Colors may vary |
| Customer Reviews | 4.6 4.6 out of 5 stars (5,032) |
| Date First Available | September 30, 2008 |
| Exterior Finish | White |
| Finish | No Finish |
| Global Trade Identification Number | 00650531935076 |
| Included Components | valve, inserts, fill hose, and assembly hardware |
| Inlet Connection Size | 0.88 Inches |
| Inlet Connection Type | Fill |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 0.035 ounces |
| Item dimensions L x W x H | 13 x 3.5 x 3 inches |
| Item model number | GP1138930 |
| Manufacturer | KOHLER |
| Material | Metal, Plastic |
| Number of Ports | 2 |
| Outlet Connection Size | 0.88 Inches |
| Outlet Connection Type | Fill |
| Part Number | GP1138930 |
| Pattern | Kit |
| Product Dimensions | 13 x 3.5 x 3 inches |
| Shape | shape |
| Size | 12.5" x 3.5" x 3" |
| Special Features | Adjustable |
| Specification Met | oem |
| Style | Plumbing Overstock |
| UPC | 650531935076 |

## Product Details

- **Brand:** Kohler
- **Exterior Finish:** White
- **Inlet Connection Size:** 0.88 Inches
- **Inlet Connection Type:** Fill
- **Item dimensions L x W x H:** 13 x 3.5 x 3 inches
- **Material:** Metal, Plastic
- **Number of Ports:** 2
- **Outlet Connection Size:** 0.88 Inches
- **Outlet Connection Type:** Fill
- **Specification Met:** oem

## Images

![Silent Fill Toilet Valve Kit, Genuine Part GP1138930, Adjustable with Multiple Fill-Rate Inserts - Image 1](https://m.media-amazon.com/images/I/51L8yOoCVEL.jpg)

## Questions & Answers

**Q: A reviewer complained that this is actually a Fluidmaster 400A.  Is that what you got or was that reviewer ripped off?**
A: It's a variation on the 400 series.  Fluidmaster makes maybe over a dozen different versions including OEM versions sold by Kohler, PerforMAX versions, ones with brass shanks, etc.  The only thing that seems to be exactly the same among all versions is the float and the (replaceable) seal.  Almost every Fluidmaster fill valve (including the 747PRO) uses the Model 242 seal.  As others noted, it comes with a set of restrictor inserts to reduce the amount of water going into the bowl.  You want to use the one that just manages to fill the bowl to the maximum around the same time as the tank is filled.  I found the green one is installed in 400A valves in an American Standard Cadet 3.  Those factory installed valves are EXACTLY the same as retail 400A valves, except for the insert and that they use a hex nut (which requires a tool to install/remove) rather than a wing nut that has to be tightened/loosened by hand.

Someone mentioned the roller clamp in the PerforMAX.  Fluidmaster has a newer one (400H) that uses a dial that varies the restriction.  Much easier to adjust than the roller clamp.  Fluidmaster has also been adding a bigger adjustment knob to most of its fill valves, so the photo might not reflect that yet.

**Q: I purchased a Kohler Fill Valve that requires you to adjust the length of the stem by turning one part in or out...Mine will not go smaller or larger?**
A: Mine had the same problem! It just spun. Somethign was stuck and I got extremely frustrated. The directions said to turn, but that did nothing. Turns out the whole base can be pulled straight out if the retaining collar is slid upward. After sliding that collar up, give it a good yank. Just don't break the valve and float at the top; I just about did. This fluidmaster video explains how. It's not the exact match, but is pretty much the same exact setup since Fluidmaster makes the official Kohler fill valve. Watch this video and you'll see what I mean: https://youtu.be/3Q-VzqqH5dg?t=1m22s

**Q: This says universal.  Can it replace the old ball and arm style fills valves?**
A: Well my Kohler toilet had a Ball and arm that came in it originally and it started leaking, and I used this to replace it. Was really quite easy to do, most difficult part is removing the water inside the tank that's left over after you turn off the water and flush. I used several old towels. You could also if you had enough space undo the fill valve and have a container to catch the water. Other than that its quite easy.

**Q: Does the Washer, Locknut and Clip come on this like the original Kohler part this replaced OR is it no longer needed with the new replacement?**
A: All required washer locknut and clip come inside the package- yes you still need them as it will install as an exact match to what was there previously

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nearly identical to 25 year old Kohler valve, easy to install even for a plumb-tard if you can Google and have slip joint pliers
*by R***T on February 13, 2017*

My original Kohler GP1138930/400a lasted nearly 25 years - amazing longevity. I knew it was dying a slow death when I would hear it fill by itself at night and running long after flushing. I ordered this new valve from Amazon about a week ago. The valve finally quit last night and I shut the water to the toilet off and fixed it today. When I removed the 25 year old fill valve today and compared it to the new one, it was nearly a dead ringer. The major change that jumped out was that the former valve had a metal float adjustment rod had been changed to a threaded plastic screw rod which is actually far easier to adjust than the previous version. One thing to know is that this new valve is expandable in length to almost 14" from the inside of the tank to the valve top simply by twisting the threaded gray valve stem. It was exactly the same setup on the 25 year old valve and I just matched the length because there are 1" increments on the gray stem up to 13" and the original was set at 13". So take note of those little details if you are replacing the same valve and save some time and aggravation The new valve comes with a variety of color coded water restrictors that go on the output hose. The original valve didn't have any of these restrictors in place so I didn't use them and the valve worked great but your situation may vary. There are some helpful installation videos on YouTube if you Google "replace Kohler 400a toilet tank valve" and go to videos. I'm very handy around the house and was a diesel and auto mechanic decades ago after college to bank some $$ prior to going back to college for pharmacy school. I can fix almost anything but plumbing always seems to be my Achilles heel, even as a diesel mechanic - hydraulic lines can be a real pain. In home plumbing, there's always a leak, a missing part, some tool I don't have, something I over tighten and break or under tighten and it leaks or the inevitable hardware store trip(s). The new valve was simple to install, didn't leak, required very common hand tools and I only made one trip to the hardware store for a new 12" stainless supply line. If I'm changing the valve, I may as well change the supply line as well, The new Kohler valve is simple to adjust for fluid flow, shutoff height and actual installation. As I mentioned, plumbing never seems to go well for me despite the fact that I can wire outlets and ground faults, light fixtures, AC units and hot tubs, install drywall, do flawless custom finish/trim work and install any sort of interior door. But my plumbing skills simply suck. So this valve MUST be easy to install if a plumb-tard like me can get it done in under an hour. I realize some folks have zero ability in this area and that's plumbers make 6 figures a year because they earn it by being really good at work that annoys others to death. If you are one of those folks, dial up your local plumber and be ready to donate $100 - $150+ for this repair. I just ordered two more of these valves, new USA made 12" stainless flex water lines and new Kohler flush handles from Amazon for my other two toilets in the same house. If one valve died after nearly 25 years, the other two have to be close to failure as well so I may as well change them all out after beating the learning curve, while my plumbing luck holds out and before the other old ones crap out - pun intended. Photos: I added some photos. The left hand photo shows the my 25 year old Kohler/Fluidmaster 400a next to the new one from Amazon. The new one has been extended by holding the gray stem and twisting the black stem to it's max length for my installation - yours may vary. The middle photo shows the removal of the small blue metering jet from the new valve. My original valve had no metering jet installed and I followed suit. Again, your situation may vary. The far right photo shows one of the weak points of the new valve. The black tube is new and is included in the kit along with the little metal squiggle annotated by the red arrow. That metal squiggle is supposed to hold the fill hose in the plastic fill pipe in the toilet tank. The old fill tube hardware annotated by the yellow arrow is the original set up that I cleaned up with CLR and reinstalled. The new metal squiggle just didn't work for me and could be a 1 star deduction in some customers eyes. New isn't always better.

### ⭐⭐⭐⭐⭐ Perfect replacement, no leaks, worked right out of the box!
*by F***R on July 24, 2021*

Gets the job done, fits perfectly, works perfectly. Is NOT silent, but also isn’t extremely noisy, but you’ll definitely hear the water flowing through the fill valve, I mean that’s just physics of water flowing through a device. It can’t be completely quite unless you want it to take forever to fill the bowl! Be realistic on your expectations of quiet vs silent water fill valves. The point is that it works, it does not leak, and it’s very easy to install and adjust. There’s really only two adjustments to make. The obvious one is the screw that moves the float up or down. Move the float up, shorten the screw length, if you want to raise the water level (the valve will cut off at a higher water level). Move the float down, extend the length of the screw, if you want to lower the water level (the valve will cut off at a lower water level). The other adjustment is the tiny plastic color-coded piece that you install before making the bowl fill extension pipe connection. Various colors indicate flow rates, higher flow rates fill the bowl with more water during each flush, lower flow rates do the opposite. Don’t bother adjusting for this until you have the water level and especially the flush valve setup for a perfect flush. Then it’s just a matter of gauging whether or not the bowl is filling with enough water and adjusting the flow rate by installing a different plastic piece if you need to. Better to slightly overfill than underfill, want to make sure you have a full bowl of water.

### ⭐⭐⭐⭐⭐ Simple installation fixes a toilet that is not automatically refilling.
*by D***Z on December 29, 2025*

On two occasions I have used this part to address a toilet that is not automatically refilling. The part works great. This in addition to Kohler's really simple "how to videos" (available online), makes the process easy. Assuming no issues, this should take < 10 minutes.

## Frequently Bought Together

- KOHLER Silent Fill Toilet Valve Kit, Genuine Part GP1138930, Adjustable with Multiple Fill-Rate Inserts
- Kohler Part 85406 2" Toilet Flush Valve Kit, Colors may vary
- Kohler (BLUE PART GP85160 FLAPPER WITH FLOAT), 2, 2 In.

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-01-31*