The Kohler San Souci K-4007-0 is a one-piece round-front toilet built for bathrooms where front-to-back space is limited and a simpler, integrated silhouette is preferred. It uses a 1.28 GPF AquaPiston flush and includes a Reveal quiet-close seat, while the standard-height bowl keeps it closer to a traditional seating position. This model is a practical fit for powder rooms and smaller baths that do not need an elongated bowl.
What rough-in size does the San Souci K-4007-0 require?
The K-4007-0 is designed for a 12-inch rough-in. As with any one-piece toilet, it is worth verifying the measurement carefully from the finished wall to the center of the closet bolts before you commit. A correct rough-in matters even more in compact bathrooms, where clearances are usually already tight.
Does the round-front San Souci still flush well at 1.28 GPF?
Yes, it is intended to. Kohler's AquaPiston design aims to move water into the bowl quickly and efficiently so the toilet can maintain strong flush performance while using less water than older models. Even though this is a compact round-front toilet, the flush system is built to provide solid everyday performance for standard residential use.
Can I replace the included Reveal seat with a different aftermarket seat?
Yes, but you need a seat made for a round-front bowl rather than an elongated one. Because bowl shape is the biggest compatibility factor, round-front fit should be confirmed first and mounting hardware spacing should be checked second. If you want the cleanest fit and finish, a Kohler round-front seat remains the lowest-risk replacement path.
Why would someone choose standard height instead of Comfort Height?
A standard-height toilet keeps the seat lower, which some households prefer because it feels more familiar and can be easier for children to use. In small guest baths or powder rooms, buyers often care more about compact size than about a taller seating position. The tradeoff is that some adults may find it less comfortable to stand up from compared with a comfort-height bowl.
Is this San Souci model considered water efficient?
Yes. The 1.28 GPF rating makes it a high-efficiency toilet relative to the long-standing 1.6 GPF standard. Under the constraints you provided, it is marked WaterSense certified, so it fits projects where lower water use is part of the decision. That makes it a reasonable option for small bathrooms that still need efficient everyday performance.
# Kohler San Souci One-Piece Round-Front Toilet **Model:** `K-4007-0` **Brand:** Kohler **Category:** Toilet > The Kohler San Souci K-4007-0 is a one-piece round-front toilet built for bathrooms where front-to-back space is limited and a simpler, integrated silhouette is preferred. It uses a 1.28 GPF AquaPiston flush and includes a Reveal quiet-close seat, while the standard-height bowl keeps it closer to a traditional seating position. This model is a practical fit for powder rooms and smaller baths that do not need an elongated bowl. ## Specifications | Attribute | Value | |---|---| | Product Type | one-piece | | Bowl Shape | round-front | | Gpf | 1.28 | | Flush Technology | AquaPiston | | Height Type | standard-height | | Seat Height In | 15 | | Trip Lever | left-hand | | Trapway | concealed | | Rough In In | 12 | | Seat Included | Yes | | Seat Type | quiet-close | | Color Finish | White | | Water Sense Certified | Yes | | Warranty | Limited Lifetime | ## What's Included - One-piece toilet - Reveal quiet-close seat - Left-hand trip lever - Mounting hardware Source: https://www.jaspecs.com/kohler/toilet/k-4007-0-kohler-san-souci-one-piece-round-front-toilet/