The Kohler Tresham K-3981-0 is a premium one-piece compact elongated toilet with a skirted trapway that gives it a cleaner, more furniture-like profile. It combines a 1.28 GPF AquaPiston flush with Comfort Height seating and an included slow-close seat, making it well suited to bathrooms where appearance and daily comfort are both priorities. The skirted base also reduces the hard-to-clean contours found on exposed trapway toilets.
What rough-in does the Tresham K-3981-0 use?
This one-piece Tresham model is intended for a 12-inch rough-in. You should measure from the finished wall to the center of the floor flange bolts before purchase, since skirted one-piece toilets generally offer less installation forgiveness than standard exposed-base bowls. Matching the rough-in correctly is the easiest way to avoid fit and clearance problems.
How does the flush performance compare to a conventional toilet?
The AquaPiston system is designed to deliver a strong gravity flush using 1.28 gallons of water, helping balance efficiency and solid waste removal. Because the canister valve opens more fully than a traditional flapper, water can enter the bowl quickly and with less restriction. That setup is aimed at providing reliable flushing performance without resorting to louder pressure-assist hardware.
Can this toilet accept an aftermarket seat even though it includes one?
Yes, you can replace the included slow-close seat if you prefer a different feel, material, or feature set. Since this is a compact elongated bowl, seat fit needs more attention than on a fully standard elongated profile, so compatibility should be verified before buying an aftermarket option. Kohler-branded seats usually offer the safest cosmetic and dimensional match.
Why choose Comfort Height on a one-piece model like this?
Comfort Height brings the seat position up to a more chair-like level, which many adults find easier for everyday use. On a premium one-piece toilet, that ergonomic benefit is often part of the overall upgrade rationale along with easier cleaning and a more refined design. It can be especially useful in primary baths or remodels intended to remain comfortable for years.
Is the Tresham K-3981-0 water efficient and WaterSense certified?
Yes. This toilet uses 1.28 gallons per flush, lowering water consumption compared with legacy 1.6 GPF and older high-volume toilets. Per your rule set, all 1.28 GPF models here are marked WaterSense certified, so this model is treated as meeting that efficiency expectation while remaining in a premium one-piece format.
# Kohler Tresham Comfort Height One-Piece Compact Elongated Toilet **Model:** `K-3981-0` **Brand:** Kohler **Category:** Toilet > The Kohler Tresham K-3981-0 is a premium one-piece compact elongated toilet with a skirted trapway that gives it a cleaner, more furniture-like profile. It combines a 1.28 GPF AquaPiston flush with Comfort Height seating and an included slow-close seat, making it well suited to bathrooms where appearance and daily comfort are both priorities. The skirted base also reduces the hard-to-clean contours found on exposed trapway toilets. ## Specifications | Attribute | Value | |---|---| | Product Type | one-piece | | Bowl Shape | compact elongated | | Gpf | 1.28 | | Flush Technology | AquaPiston | | Height Type | comfort-height | | Seat Height In | 17.5 | | Trip Lever | left-hand | | Trapway | concealed | | Rough In In | 12 | | Seat Included | Yes | | Seat Type | slow-close | | Color Finish | White | | Water Sense Certified | Yes | | Warranty | Limited Lifetime | ## What's Included - One-piece toilet - Slow-close seat - Left-hand trip lever - Mounting hardware Source: https://www.jaspecs.com/kohler/toilet/k-3981-0-kohler-tresham-comfort-height-one-piece-skirted-toilet/