This item offers automatic, touchless operation for a more hygienic and comfortable experience. The hands-free function reduces the risk of contamination, disease, and the spread of germs by dispensing soap without contact. The 3 liters (.08 gallons) reservoir and controller set is designed to work with one chrome-plated spout. TOTO biodegradable, Green Seal™ soap (TSFB) or antimicrobial soap (TSFG) is required for proper functionality. Includes controller base unit with 3 liters (0.8 gallons) reservoir, mounting hardware, and supply lines.