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

$1,620.75
$1,215.56
Color: White

This product is currently not available for online purchase.

To explore this item, check availability, or get expert design guidance, schedule a complimentary showroom appointment with one of our design experts!

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 comfort while occupying the same space as a round-front bowl
  • Comfort Height feature offers chair-height seating that makes sitting down and standing up easier for most adults
  • Concealed trapway and Clean Caps low-profile bolt caps facilitate easier cleaning and enhance design
  • Right-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
  • 1.28 gpf (4.8 lpf)
  • 2-1/8" (54 mm) fully glazed trapway

Additional Resources:
Spec Sheet
Installation Instructions
Parts Sheet

Recommended and Optional Accessories:
KOHLER K-4108 PureWash E750 Elongated bidet toilet seat with remote control
KOHLER K-9131-R Kathryn Trip lever for K-3940-RA
KOHLER K-23726 Drain treatment
KOHLER K-4733 Glenbury Quiet-Close elongated toilet seat

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