Item # bci2910832

Kohler Memoirs 1.28 GPF Elongated One-Piece Comfort Height Toilet with AquaPiston Technology - Seat Included

Model: K-6424-K4

$1,125.00 - $1,681.95
Finish: Choose Finish
  • Biscuit
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  • Black Black
    Black Black
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  • Dune
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  • Ice Grey
    Ice Grey
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  • Thunder Grey
    Thunder Grey
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  • White
    53 In Stock

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Product Overview

Product Features:

  • One-piece configuration provides a uniform look and simplifies installation
  • Compact-elongated bowl offers comfort and convenience of an elongated bowl while occupying the same space as a rount-front bowl
  • Covered under Kohler's 1 year limited warranty
  • Left hand trip lever
  • Memoirs collection is steeped in the traditions of classic Americana, bringing a playful eccentricity and eclectic elegance to the bathroom
  • Constructed of durable, easy to clean vitreous china
  • Installs in a floor mounted configuration
  • Features a powerful gravity flush with AquaPiston technology
  • ADA compliant - complies with the standards for toilets set forth by the Americans with Disabilities Act
  • Comfort Height - designed for ease of use, with a higher than average bowl
  • WaterSense certified - toilet uses 20% less water than the current standard while still maintaining superior performance
  • Concealed trapway - a built-in skirt hides the discharge passageway from view, for a smoother, less utilitarian appearance
  • Skirted trapway  simplifies cleaning
  • Best in class installation methods allowing for 10, 12, or 14 inch rough ins
    • 10 and 14 inch kits sold separately (K-5381 and K-5383)
  • Includes a soft close seat with cover

Product Technologies / Benefits:

  • Easy to Clean: One-piece toilets integrate the tank and bowl into a seamless easy-to-clean design. Because the toilet's shape has fewer crevasses than two-piece models, there are not as many spaces for dirt to hide. This model also features a fully skirted trapway, meaning that the sides of the toilet are smooth and flat. This feature simplifies cleaning and offers a look that is aesthetically pleasing as well.
  • Simplified Installation: The Tresham one-piece toilet features an innovative trapway installation system. The system anchors the toilet to the floor for a secure, caulk-free installation. The standard 12" rough-in requires no drilling, no special tools and is easy to install on all floor types. There are also kits available to accommodate 10 and 14 inch rough-in installations.
  • AquaPiston: AquaPiston single flush canister technology uses the force of gravity and a precision-engineered tank, bowl, and trapway to create a strong, efficient siphon during flushing. The canister flush valve's 3:2 ratio optimizes flush performance and resists warping and deterioration, while its durable design features 90% less exposed seal material than a standard 3-inch flapper flush valve, guaranteeing leak-free performance. The light-touch canister requires lower activation force than a flapper, and once activated, allows water to flow into the bowl from all sides (360 degrees), increasing each flush's power and effectiveness.
  • Comfort Height: Comfort Height toilets offer the greatest accessibility and ease of use with a bowl height of between 16-1/2" and 18", the same as a standard chair.
  • WaterSense Certified Product: To help make a difference on a global scale and to further its role as an industry leader in eco-performance practices, Kohler has established partnerships with a number of environmental organizations, including WaterSense. Many Kohler faucets and toilets are equipped with low-flow technology - they use less water, while continuing to meet superior performance standards.

Product Specifications:

  • Overall Height: 28-1/4" (measured from bottom of base to top of tank)
  • Overall Depth: 27-3/4" (measured from back of tank to front of rim)
  • Overall Width: 18" (measured from rightmost to leftmost edge of toilet)
  • Bowl Height: 16-1/2" (measured from floor to bowl rim)
  • Flow Rate: 1.28 GPF (gallons per flush)
  • Water Area: 9-5/8" x 7-3/8" (inner rim dimensions of bowl, length x width)
  • Water Depth (from Rim): 5-3/8"
  • Tank Width: 18" (measured from leftmost to rightmost edge of tank)
  • Tank Depth: 7-1/16" (measured from back edge to front edge of tank)
  • Trapway (Discharge Passageway) Size: 2-1/2"
  • Distance Between Toilet Seat Installation Holes: 5-1/2"
  • Rough-In: 12"
    Inspired by elegant architecture and crown molding, this Memoirs collection toilet with Classic design delivers functionality and water savings--as well as traditional style. A high-efficiency 1.28-gallon flush offers up to 16,500 gallons of water savings per year (versus a 3.5-gallon toilet) without sacrificing performance. The included seat, positioned at chair height for your comfort, features technology for noiseless closing and easy cleaning.

This product is listed under the following manufacturer number(s):

*Denotes a finish or option that has been discontinued.

Dimensions and Measurements

Bowl Height
16.5 in.
27.75 in.
Flush Valve Size
3 in.
Gallons Per Flush
28.25 in.
Rough In
12 in.
2.125 in.
Water Area
9.625 x 7.375
18 in.

Included Components

Angle Supply Included
Seat Included

Characteristics and Features

Bowl Shape
One Piece
Design Features
Concealed Trapway, Soft Close, Chair Height
Flush Type
Gravity Flush
Installation Type
Floor Mounted
Vitreous China
Seat Front
Trip Lever Finish
Trip Lever Placement
Water Efficient

Manufacturer Technology

Flush Technology

Warranty and Product Information

Approved for Commercial Use
CA Drought Compliant
Memoirs, Comfort Height
Country Of Origin
CSA Code
Manufacturer Warranty
1 Year Limited
TX Drought Compliant
WaterSense Certified
Product Videos
  • If you have been considering replacing your toilet, yet are wondering how complicated of a job this is? Take a moment and we'll show you just how simple this job can actually be.
    How to remove and install a Toilet
    If you have been considering replacing your toilet, yet are wonde...
  • Kohler AquaPiston technology provides the industry's best flush.
    Kohler AquaPiston Technology
    Kohler AquaPiston technology provides the industry's best flu...
How to remove and install a Toilet

How to remove and install a Toilet

If you have been considering replacing your toilet, yet are wondering how complicated of a job this is? Take a moment and we'll show you just how simple this job can actually be.

Kohler AquaPiston Technology

Kohler AquaPiston Technology

Kohler AquaPiston technology provides the industry's best flush.