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Internet # 312095888

Model # 528XCM

Store SKU # 1005022766

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2X Long Life Toilet Fill Valve

$15.97
  • Toilet fill valve fits 99% of toilets
  • 10-year warranty: built with 2X stronger materials
  • Easy and quick installation
  • View More Details

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Product Details

About This Product

The Korky 2X Long Life Toilet Fill Valve is the longest lasting, most universal fill valve available. The proprietary Chlorazone II rubber formulation lasts 2 times longer than other fill valves and is backed by a 10 year warranty to hold up in the harshest environments. Designed to fix no fill, slow refilling, running, and noisy toilets, the Korky 2X Toilet Fill Valve is quieter than other fill valves and is ideal for toilets since 1994 1.6 GPF or less. It is fully adjustable to prevent water waste in all toilets. The refill adjuster delivers the right amount of water to the bowl to maintain original performance. This toilet fill valve is easy to install and adjust; no tools are required. Simply remove your old fill valve or ballcock, insert your new Korky fill valve, adjust and you're done. The innovative twist-lock adjustment makes installation easy. Designed to fit more toilets, the Korky toilet fill valve adjusts to fit both large and compact toilet tanks and fits Kohler, TOTO, American Standard and all other brands. Easy to install, the 528X Includes: 528X Fill Valve, Refill Tube, Metal Refill Tube Clip, Installation Hardware Tamper Proof Key, Refill Adjuster, and Instructions.

Highlights

  • Designed for newer, HET toilets, maximize your toilet's performance by delivering just the right amount of water to the bowl
  • Toilet Fill Valve fits 99% of toilets
  • Proprietary clomazone II rubber last 2 times longer than other fill valves
  • Fixes: running, noisy, no/slow refill and no/weak flush toilets
  • Strainer catches sediment in the water and allows valve to be serviceable
  • 10-year warranty
  • Includes: one 528X fill valve, 1 refill tube, 1 metal refill tube clip, 1 mounting nut, 1 tamper proof key, 1 refill adjuster and 1 instructions
  • Return Policy

Product Information

Internet # 312095888

Model # 528XCM

Store SKU # 1005022766

Additional Resources

Shop All Korky

Specifications

Dimensions: H 14 in, W 5.25 in, D 2.43 in

Dimensions

Product Depth (in.)

2.43 in

Product Height (in.)

14 in

Product Width (in.)

5.25 in

Details

Adjustable Fit

Yes

Color/Finish Family

Black

Features

No Additional Features

Included

Hardware Included

Material

Plastic

Pack Size

1

Plumbing Part Type

Toilet Fill Valve

Returnable

90-Day

Style

Basics

Valve Type

Fill

Warranty / Certifications

Manufacturer Warranty

10 Year Warranty

Questions & Answers

is it ok to use Clorox blech tabs
ByJan 7, 2026
1 Answer | 
Answer This Question

No! It will void the toilet warranty and also Korky warranty

By|Apr 19, 2026


    what fill valve will work with CST864E?
    ByDec 4, 2025
    0 Answer | 
    Answer This Question

    Water is overflowing. How to adjust the filler valve?
    ByAug 19, 2025
    0 Answer | 
    Answer This Question

    Is this compatible with Toto CST853e
    ByMay 21, 2025
    0 Answer | 
    Answer This Question

    Will this work for Toto ST454ET?
    ByDec 16, 2024
    1 Answer | 
    Answer This Question

    This fill valve is compatible with most toilets, including Toto toilets. It adjusts to fit both large and compact toilet tanks and is designed to work with Toto, Kohler, American Standard, and all other brands.

    By|Mar 9, 2026

    (1)

    Does this on fit the same tanks that the Platinum model fits?
    ByAug 9, 2024
    1 Answer | 
    Answer This Question

    This fill valve is designed to fit a wide range of toilets, including many of the same tanks that the Platinum model fits. It adjusts to fit both large and compact toilet tanks and is compatible with Kohler, TOTO, American Standard, and other brands.

    By|Jun 11, 2026

    (1)

    Is this 528X compatible with Toto toilet model CST 854?
    ByJun 19, 2024
    1 Answer | 
    Answer This Question

    Thank you for contacting Korky products. The fill valves that are compatible with your toilet are 528T,528GT, and 528MP. Let me know if you have further questions. Thanks-1800-528-3553 Thank you!

    By|Jun 20, 2024


      Will this work in a ccl drake 2 piece st454e
      ByNov 26, 2023
      1 Answer | 
      Answer This Question

      Yes, this product is compatible.

      By|Nov 27, 2023


        Viewing 1-8 of 15

        Customer Reviews

        4.4 out of 5

        • 4.4 out of 1,656 reviews
        • 77% recommend this product
        Filter by:
        Showing 1-10 of 1,656 reviews
        Easy to install. Step by step instructions.
        by
        • Verified Purchase
        The fact that this is a long-life product was the key feature for me. I use a well to supply water to my home. The fact that the water is untreated has an effect on fixtures and appliances. My water quality is better than that of other wells, but it is a concern. I anticipate that I will get many years of service out of this product. It was simple to install and adjust. I like simple.
        by
        A better way for Kohler tower style.
        Easy to install and clear instructions. But I don’t like the metal and black clips for a Kohler tower. The water splashed everywhere. I cut the old tube and used a heat gun to warm up the new tube. Then fitted the old tube inside the new tube. It’s cleaner and no splash!
        by
          • Recommended
          1 found this review helpful
          Randomly stays running. Do not recommend.
          Found this to randomly keep filling. It was installed correctly according to installation instructions. Typically i stick to Fluidmaster but wanted to try this brand as i was not to happy replacing fluidmaster ever 5 years. No telling how many times this thing has randomly kept running but i am swapping it for a fluidmaster and never buying Korky brand again. Based on my experience i cannot recommend this fill valve.
          by
            3 found this review helpful
            Replaced the cheaper modwl with better model
            Got this for old one piece Kohler. It's thr Rosario series toilet. Old one was similar type of fill valve but it kept filling the tank. It's te one with white/silver top. This one is black top which supposed to last longer and longer warranty. Install was very easy. I bought a new connector hose as well.
            by
              • Recommended
              Terrible product! Leaked after installation. Sitting at the bottom of the trash bin.
              by
              • Verified Purchase
              5 found this review helpful
              Lasted 2 months
              Very dissatisfied with the quality of this fill valve. Purchased 2 months ago and now the toilet makes strange fill noises continuously. Will stop at times then go on and on. The valve does the job but I believe there is something wrong inside the valve. I tried eliminating the pressure regulating valve but that didn't work. Very frustrated. I went from Fluidmaster to Korky now I'm going back to Fluidmaster. I'll attach a video so you can see what I'm talking about.
              by
                4 found this review helpful
                My one-piece toilet uses an extremely small corner mount fill valve and I could not find anything that would fit, until I discovered the Korky Fill Valve. It has an adjustable height and fits perfect in the corner of the tank. It performs flawlessly too. Very Happy!
                by
                Response from Korky Toilet GeniusApr 2, 2024
                Thanks for taking the time to write a review. We are glad to hear your Korky is working well for you. If you have additional questions, our customer service team is here and happy to help. Please dial 262-763-2434 or email us at sales@lavelle.com. We are available Monday through Friday, 7:30AM to 5:00 PM CST. Korky
                • Verified Purchase
                4 found this review helpful
                Works well. Follow the instructions.
                The Korky 2X Long Life Toilet Fill Valve (528X) was a good replacement for my 20 year old failing ball float mechanism fill valve. The adjustability allowed me to dial in the proper height within a few tries. Make sure you use the height locking tab. I didn't on one install and the valve slid lower after a month of flushes and started to run water continuously into the fill tube. Caught early, but entirely avoidable if the instructions were followed. Doh. Construction seems fine and sturdy. I like the new integrated float design and hope it performs well for years to come.
                by
                • Verified Purchase
                • Recommended
                3 found this review helpful
                Super easy to install. I did the repair in approximately 15 minutes.
                Super easy to install. I did the repair in approximately 15 minutes.
                by
                • Verified Purchase
                • Recommended
                4 found this review helpful
                Showing 1-10 of 1,656 reviews

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                Product Snapshot

                Ideal for upgrading your toilet with a durable, long-lasting fill valve, ensuring quiet and efficient performance for years to come.
                Ideal for upgrading toilets with quiet, powerful fills and durable seals, ensuring optimal performance and water savings.
                Ideal for plumbers or DIYers seeking a reliable, easy-to-install fill valve with a 5-year warranty.
                Ideal for Toto toilet owners seeking a reliable, easy-to-install fill valve with a 5-year warranty.

                Adjustable Height

                Anti-Siphon Protection

                Water Flow Rate

                Water Efficiency

                Saves water and money

                Material Quality

                Chlorazone II Rubber
                Silicone seals last up to 10 times longer
                Corrosion-resistant materials
                Plastic