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KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf

KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf

Capture the classic look of the 1930s with the Kathryn collection's angular lines and molded edges. This one-piece toilet features a convenient chair-like height and compact elongated bowl for comfortable use, as well as a concealed trapway for sleek looks and simple cleaning. A 1.28-gallon flush provides significant water savings of up to 16,500 gallons per year, compared to a 3.5-gallon toilet, without sacrificing performance. This tank features innovative AquaPiston technology, a patented flush engine that delivers a fast, powerful, and virtually plug-free flush.


  • One-piece toilets integrate the tank and bowl into a seamless, easy-to-clean design
  • Compact elongated bowl offers added comForte while occupying the same space as a round-front bowl
  • ComForte Height feature offers chair-height seating that makes sitting down and standing up easier for most adults
  • 1.28 gpf (4.8 lpf)
  • Concealed trapway and Clean Caps low-profile bolt caps facilitate easier cleaning and enhance design
  • Left-hand Polished Chrome trip lever
  • Coordinates with other products in the Kathryn collection
  • Easy-to-flush canister design requires less force to actuate than a 3" (76 mm) flapper, and has 90% less exposed seal material which resists conditions that cause wear, tear, shrinkage and swelling
  • Eligible for consumer rebates in some municipalities
  • Quiet-Close compact elongated lid and seat prevents slamming
  • Quick-Release functionality allows seat to be removed easily from toilet for convenient cleaning
  • AquaPiston canister optimizes the flow out of the tank, harnessing gravity and the natural powerful reducing cascade of water to increase the power and effectiveness of the flush

Additional Resources:
Spec Sheet
Installation Instructions
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From $934.46
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf—
$934.46
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Description

Capture the classic look of the 1930s with the Kathryn collection's angular lines and molded edges. This one-piece toilet features a convenient chair-like height and compact elongated bowl for comfortable use, as well as a concealed trapway for sleek looks and simple cleaning. A 1.28-gallon flush provides significant water savings of up to 16,500 gallons per year, compared to a 3.5-gallon toilet, without sacrificing performance. This tank features innovative AquaPiston technology, a patented flush engine that delivers a fast, powerful, and virtually plug-free flush.


  • One-piece toilets integrate the tank and bowl into a seamless, easy-to-clean design
  • Compact elongated bowl offers added comForte while occupying the same space as a round-front bowl
  • ComForte Height feature offers chair-height seating that makes sitting down and standing up easier for most adults
  • 1.28 gpf (4.8 lpf)
  • Concealed trapway and Clean Caps low-profile bolt caps facilitate easier cleaning and enhance design
  • Left-hand Polished Chrome trip lever
  • Coordinates with other products in the Kathryn collection
  • Easy-to-flush canister design requires less force to actuate than a 3" (76 mm) flapper, and has 90% less exposed seal material which resists conditions that cause wear, tear, shrinkage and swelling
  • Eligible for consumer rebates in some municipalities
  • Quiet-Close compact elongated lid and seat prevents slamming
  • Quick-Release functionality allows seat to be removed easily from toilet for convenient cleaning
  • AquaPiston canister optimizes the flow out of the tank, harnessing gravity and the natural powerful reducing cascade of water to increase the power and effectiveness of the flush

Additional Resources:
Spec Sheet
Installation Instructions