Item # bci1811111

Kohler Devonshire 1.28 GPF Toilet Tank Only with Right Hand Trip Lever and AquaPiston Technology

Model: K-4438-RA-0

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  • Biscuit
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  • White
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Product Overview

Product Features:

  • Tank only configuration - allows the opportunity to match pieces with a selected bowl
  • Covered under Kohler's 1 year limited warranty
  • The Devonshire Collection captures the elegance of a bygone era with elements reminiscent of old-world design
  • Constructed of durable, easy to clean vitreous china
  • Features a powerful gravity flush with AquaPiston technology
  • WaterSense certified - toilet uses 20% less water than the current standard while still maintaining superior performance

Product Technologies / Benefits:

  • 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.
  • 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: 14-1/4" (measured from bottom to top of tank)
  • Overall Depth: 7-13/16" (measured from back to front of tank)
  • Overall Width: 17-1/4" (measured from rightmost to leftmost edge of tank)
  • Flow Rate: 1.28 GPF (gallons per flush)


  • K-4438-RA: This model
  • K-4438: This model with left hand trip lever
  • K-3837-RA: This model with bowl (complete toilet fixture)

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

*Denotes a finish or option that has been discontinued.

Manufacturer Resources

Dimensions and Measurements

7.813 in.
Flush Valve Size
3.5 in.
Gallons Per Flush
14.25 in.
17.25 in.

Characteristics and Features

Tank Only
Flush Type
Gravity Flush
Vitreous China
Water Efficient

Manufacturer Technology

Flush Technology
Class Five

Warranty and Product Information

CA Drought Compliant
Country Of Origin
TX Drought Compliant
WaterSense Certified