Kohler Tresham 1.28 GPF Elongated One-Piece Comfort Height Toilet with AquaPiston Technology and Right Hand Trip Lever

Model: K-3981-RA-0

Finish: Choose Finish
  • White
    10 In Stock
Trip Lever Placement: Right

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Leaves the Warehouse Today, February 22nd
10 In Stock

Product Overview

Kohler K-3981-RA 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
  • 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
  • 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.

Kohler K-3981-RA Specifications:

  • Overall Height: 28-1/2" (bottom of base to top of tank)
  • Overall Depth: 28-1/4" (back of tank to front of rim)
  • Overall Width: 17-5/16" (rightmost to leftmost edge of toilet)
  • Bowl Height: 16-1/2" (floor to bowl rim)
  • Flow Rate: 1.28 GPF
  • Water Area: 9-5/8" x 6-7/8" (inner rim dimensions of bowl, length x width)
  • Water Depth (from Rim): 5-3/8"
  • Tank Width: 17-5/16" (leftmost to rightmost edge of tank)
  • Tank Depth: 7-11/16" (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"

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.
28.25 in.
Flush Valve Size
3 in.
Gallons Per Flush
28.5 in.
Hinge Center to Center
5.5 in.
Rough In
12 in.
2.125 in.
Water Area
9.625 x 6.875
17.44 in.

Included Components

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

ANSI Certification
Approved for Commercial Use
CA Drought Compliant
Tresham, Comfort Height
Country Of Origin
CSA Code
B45.1, B651
Manufacturer Warranty
1 Year Limited
TX Drought Compliant
WaterSense Certified