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Internet # 306548194

Model # RGP1188998

Store SKU # 1003594698

2 in. Toilet Flush Valve Kit

$20.55
  • KOHLER GENUINE PART
  • Compatible with KOHLER Cimarron® toilet tanks K-4369 and K-4418
  • 3" canister with a 2" base
  • View More Details

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Product Details

About This Product

Protect the warranty on KOHLER products, always look for the KOHLER Genuine Parts logo. This flush valve was designed by KOHLER engineers to maintain original product performance and promote product longevity. Replace your old or leaky flush valve with an OEM KOHLER part.

Highlights

  • Canister flush valve kit for KOHLER cimarron toilets
  • 3 in. canister with a 2 in. base
  • Compatible with tank model numbers K-4369 and K-4418
  • Look inside the back wall of the toilet tank to identify tank model number
  • Quick connect
  • Complete assembly with tank-to-bowl gasket
  • Maximizes performance
  • Return Policy

Product Information

Internet # 306548194

Model # RGP1188998

Store SKU # 1003594698

Additional Resources

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From the Manufacturer

Specifications

Dimensions

Product Length (in.)

4.5 in

Product Width (in.)

4 in

Details

Color/Finish Family

Black

Features

No Additional Features

Included

No Additional Items

Material

Plastic

Pack Size

1

Plumbing Part Type

Gasket

Returnable

90-Day

Warranty / Certifications

Manufacturer Warranty

One-Year Limited Warranty

Questions & Answers

does the flush kit fit K-4436-AA tank ?
ByApr 29, 2026
1 Answer | 
Answer This Question

Hello Warren, this is Lisa with Kohler Co. I am glad to assist with your question. The referenced flush valve is not compatible with your K-4436 toilet tank. The compatible flush valve is K-1117210 - https://tinyurl.com/mv6vumtv. Thank you for choosing Kohler.

By|Apr 30, 2026


    Is the upper cylinder piece compatible with a K-4166 toilet flush valve. The upper connection where the fill hose connects to the cylinder internals is broken on my flush valve. I am wondering if the cylinder and internals of this valve is compatible?
    ByMar 20, 2026
    1 Answer | 
    Answer This Question

    John, this is Paige with Kohler Customer Service. I am happy to help. The part needed is K-GP1229656. Thank you for choosing Kohler.

    By|Mar 24, 2026


      Will this fit toilet 3275 If not which on will
      ByMar 20, 2026
      1 Answer | 
      Answer This Question

      Hi Cpdew, this is Autumn with Kohler Customer Service. I am glad to address your question. K-3275 is not populating as a valid model number. If there is any way we can provide further presale assistance, please contact us directly at 1-800-456-4537 M-F 8-5 CST. We’re glad to help! Thank you for choosing Kohler.

      By|Mar 20, 2026


        my kohler tank is model K-4620. I understand that kohler recommends a flapper type flush valve. I would prefer to replace the flapper with a canister type flush valve. will this flush valve work properly in my K-4620 tank?
        ByMar 19, 2026
        1 Answer | 
        Answer This Question

        Harry, this is Paige with Kohler Customer Service. I am happy to help. You cannot replace a flapper style flush valve with a cannister style. The flush valve for the K-4620 toilet is K-85406. Thank you for choosing Kohler.

        By|Mar 19, 2026


          Will this fit tank F33573-CS-AA?
          ByMar 16, 2026
          1 Answer | 
          Answer This Question

          Hi Judy, my name is Meli with Kohler Co. I am happy to assist with your question. The compatible flush valve for the F33573-CS-AA is the K-1516891. Thank you for choosing Kohler.

          By|Mar 17, 2026


            I just need the yellow plastic piston piece. Can I buy it without the whole setup
            ByMar 13, 2026
            1 Answer | 
            Answer This Question

            RuthAnn, my name is Jessica with Kohler Customer Service. I am happy to assist with your inquiry. The stop on the top of K- RGP1188998 is available as part of the the canister repair kit K-GP1229656. Thank you for choosing Kohler.

            By|Mar 13, 2026


              We installed the Kohler Cimarron toilet 4 months ago, and now the valve is leaking to a point the tank refills every 3-5 minutes. Single flush valve. Has anyone else experienced this so quickly?
              ByFeb 10, 2026
              1 Answer | 
              Answer This Question

              Hello Mike, this is Lisa with Kohler Co. I am happy to address your inquiry. If there was a leak that was occurring with your flush valve, you will want to ensure the chain that comes off the canister flush valve is taut. There should be no slack in the chain (1-2 links at most). The black refill tube in the toilet should be connected on both ends; from the fill valve to the top of the canister flush valve. The water level in the tank should also be to the waterline marking listed on the canister flush valve. If that does not correct what was occurring a replacement part would be needed. We are happy to help with a warranty replacement part. Please feel free to contact us at 1-800-4KOHLER. We are available Monday through Friday, from 8 a.m. - 5 p.m. CST. We are glad to help! Thank you for choosing Kohler.

              By|Feb 12, 2026


                Hello Will this flush valve kit, RGP1188998, work with my Kohler #K-31648. I can not find my tank number listed for any of the replacement parts Thanks
                ByJan 19, 2026
                1 Answer | 
                Answer This Question

                Hi Robert, my name is Meli with Kohler Co. I am happy to assist with your question. The compatible flush valve for the K-31648 is the K-1421078. Thank you for choosing Kohler.

                By|Jan 20, 2026


                  Viewing 1-8 of 174

                  Customer Reviews

                  4.8 out of 5

                  • 4.8 out of 225 reviews
                  • 78% recommend this product
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                  Showing 1-10 of 225 reviews
                  The project went as smooth as a great number 2! The online ordering was simple, the product arrived quickly and safely packed and the instructions were easy to follow. It only took me 4 hours to install and clean up afterwards! This was the greatest toilet experience I've had in a great many years!
                  by
                  The Kohler toilet valve kit is worth every cent. It is made of durable plastic and fits perfectly in the water tank. I highly recommend it.
                  by
                  Very flimsy connection below the yellow plunger
                  by
                  Response from Kohler Product ExpertMay 6, 2026
                  Hello Brian, this is Paige with Kohler Co. I am sorry to hear that the 2 in. flush valve is not as sturdy as expected. We would be happy to connect with you to learn more about your situation and how we can help. Please email KohlerCustServ@kohler.com for further assistance. Kindly, Paige S. -Kohler Customer Service
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                  The right part for the toilet repair!
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                  Compare Key Features

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                  Product Snapshot

                  Ideal for KOHLER Cimarron toilet owners seeking a reliable and easy-to-install flush valve kit for optimal performance.
                  Ideal for leak repair, this universal tank-to-bowl gasket system fits most 2 in. flush valve toilets, ensuring a secure seal.
                  Ideal for KOHLER Wellworth toilet owners seeking a reliable and easy-to-install flush valve kit for optimal performance.
                  Ideal for KOHLER Cimarron toilet owners seeking a reliable and genuine replacement flush valve kit for optimal performance.

                  Leak-proof design

                  Antimicrobial properties

                  Dimensions

                  H: 12 in., W: 4 in., D: 4.5 in.
                  L 9.125 in. x W 9.125 in. x H 7.875 in. x D 1.5 in.
                  H 12.6 in, W 5.6 in, D 5.6 in
                  H 12.6 in. x W 5.6 in. x D 5.6 in.

                  Material

                  Plastic
                  Sponge rubber, Flexible rubber, Stainless steel
                  Plastic
                  Plastic

                  Temperature resistance