The TOTO Nexus 1G WASHLET+ Ready 1.0 GPF Toilet Tank with Auto Flush Compatibility has a sleek and clean high-profile design, upholding TOTO’s vision to create a culture of comfortable, healthy living. The TOTO Nexus 1G Tank features TOTO’s industry leading 1G technology, offering a powerful flush that flushes completely and fully with only one gallon of water. This tank model features TOTO’s TORNADO FLUSH, a hole-free rim design with dual-nozzles that creates a centrifugal washing action that assists in rinsing the bowl more efficiently. This highly efficient flushing system helps reduce the frequency of toilet cleanings, minimizing the usage of water, harsh chemicals, and time required for cleaning. This version of the Nexus tank offers TOTO T40 WASHLET+ and Auto Flush compatibility for when you are ready to upgrade to a hands-free flush system with electronic bidet seat. The Nexus tank is ADA compliant and meets the standards for EPA WaterSense®, and California’s CEC and CALGreen requirements. The TOTO Nexus is made with durable vitreous china (ceramic) material and has a left-hand chrome trip lever. Additional items needed for installation and use must be purchased separately: Nexus Elongated Universal Height Toilet Bowl, compatible seat, wax ring, toilet mounting bolts, water supply lines, and optional WASHLET+ with Auto Flush kit.