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

Specification Sheet
Installation Guide
Parts Breakdown

Recommended Products/Accessories

KOHLER 1023457 Toilet Wax Ring And Hardware Kit
KOHLER 1265114 12" Toilet Supply Line
KOHLER K-23726 Drain treatment
KOHLER K-4108 Elongated bidet toilet seat with remote control

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From $425.45

Original: $1,215.56

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

$1,215.56

$425.45

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KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 2
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 3
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 4
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 5
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 6
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 7
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 8
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 9
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 10
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 11
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 12
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 13
KOHLER K-3940 Kathryn One-piece compact elongated toilet with concealed trapway, 1.28 gpf - Image 14

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

Specification Sheet
Installation Guide
Parts Breakdown

Recommended Products/Accessories

KOHLER 1023457 Toilet Wax Ring And Hardware Kit
KOHLER 1265114 12" Toilet Supply Line
KOHLER K-23726 Drain treatment
KOHLER K-4108 Elongated bidet toilet seat with remote control

Product Information

Shipping & Returns

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

Specification Sheet
Installation Guide
Parts Breakdown

Recommended Products/Accessories

KOHLER 1023457 Toilet Wax Ring And Hardware Kit
KOHLER 1265114 12" Toilet Supply Line
KOHLER K-23726 Drain treatment
KOHLER K-4108 Elongated bidet toilet seat with remote control