VILLEROY & BOCH. The WaterSense-certified Subway dual-flush toilet allows users to choose a half flush (1.0 gpf) or a full flush (1.6 gpf). The sleek, space-saving unit incorporates jet technology to ensure high-performance flushing capabilities, the firm says. Measuring 283/8 by 15 by 28¾ inches, the one-piece toilet includes a soft-closing seat with quick-release functionality for easy cleaning.