Toto cst646cemfgnat40 One Piece Elongated Dual Flush Toilet

Product Description

The TOTO cst646cemfgnat40 is a one-piece elongated toilet from the Aquia IV collection, designed for floor-mounted installation in residential and commercial bathrooms. It uses a gravity-fed Dynamax Tornado Flush system with dual-flush push-button operation, offering a 0.9 or 1.28 gallon-per-flush selection to match usage demand. The one-piece vitreous china construction eliminates the exposed joint between tank and bowl, simplifying cleaning and reducing leak points. The concealed trapway adds a skirted profile that removes visible discharge passageway hardware. WaterSense certified, this toilet uses at least 20 percent less water than the federal standard while maintaining full flush performance.

This toilet fits standard residential and light commercial bathroom applications where a modern, low-profile one-piece fixture is specified. The elongated bowl extends approximately 1.5 inches beyond a round configuration, providing additional user comfort. The unit is configured to accept a bidet seat but does not include one. No standard toilet seat is included. All mounting hardware required for installation ships with the unit. The Aquia IV collection offers coordinating fixtures for those specifying a matched bathroom suite.

Key Features

• Dual-flush push-button lid-top actuator: 0.9 GPF liquid flush and 1.28 GPF solid flush
• Dynamax Tornado Flush gravity system for consistent bowl coverage
• Concealed trapway with skirted base for a clean, utilitarian-free profile
• WaterSense certified and compliant with California and Texas drought regulations
• Vitreous china construction with premier corrosion- and tarnish-resistant finish
• Configured for bidet seat installation; seat not included
• ASME certified; covered under a 1-year limited manufacturer warranty

Compatibility

Designed for floor-mounted installation with a 12-inch rough-in. Part of the TOTO Aquia IV collection and coordinates with other fixtures in that line. Configured to accept a compatible bidet seat; no seat is included with this unit.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the IPC. Shut off the water supply and confirm the rough-in dimension is 12 inches before setting the fixture. The one-piece design eliminates tank-to-bowl assembly but requires careful handling given the 118-pound unit weight. All required hardware is included; do not use hardware not rated for vitreous china to avoid cracking the base.

Technical Specifications

• Flush Rate: 0.9 GPF / 1.28 GPF
• Flush Type: Gravity Flush (Dynamax Tornado Flush)
• Flush Actuator: Lid-top dual push button
• Bowl Shape: Elongated
• Configuration: One Piece
• Installation Type: Floor Mounted
• Rough-In: 12 inches
• Trapway Diameter: 2.25 inches
• Bowl Height: 16.125 inches
• Overall Height: 28.375 inches
• Depth: 28.25 inches
• Width: 15.1875 inches
• Product Weight: 118 pounds
• Material: Vitreous China
• Seat Included: No
• Bidet Seat Included: No
• Electronic: No
• Certifications: WaterSense, ASME
• Drought Compliance: California, Texas
• Warranty: 1 Year Limited
• Collection: Aquia IV

Standard Information

• Brand: TOTO
• Manufacturer Part Number: cst646cemfgnat40