American Standard. Redesigned Yorkville pressure-assisted two-piece toilets are equipped with a pressure-assisted siphon jet flushing action and a fully glazed 21/8-inch trapway. The design combination allows the Yorkville product line to perform with fewer clogs, removing as much as 1,000 grams of waste with each flush. The Yorkville FloWise elongated model is a WaterSense-certified high-efficiency toilet that consumes just 1.1 gallons per flush (gpf). A 1.6 gpf model is also available. Both versions are offered with ADA-approved Right Height elongated bowls. 800.899.2614.