Kohler Highline Arc Two-Piece Toilet vs Kohler Highline Arc Extra-Tall Toilet

Both are Kohler Highline Arc two-piece elongated toilets with a 1.28 gpf single flush, a 12-inch rough-in and a slow-close seat. The real split is height and completeness. The K-31096-0 is the Complete Solution: it ships with the wax ring and hardware, and its Revolution 360 flush with the AquaPiston valve is Kohler's strongest bowl-cleaning setup in this line. The 78305-0 is the extra-tall model, built for taller users or anyone who wants less bending. Owners of Highline toilets generally praise the flush and the seat; the common gripes are the plastic seat feel and the occasional fill valve. Buy the K-31096-0 for a standard-height bathroom and a full install kit; buy the 78305-0 only if the extra height matters.

• Choose the Kohler K-31096-0 if you want a standard comfort-height toilet that arrives with the seat, wax ring and hardware, and you value the Revolution 360 flush.
• Choose the Kohler 78305-0 if you need the extra-tall bowl height for easier sitting and standing, and you can supply the wax ring and bolts yourself.