The TOTO hose is vital to connect the Auto Sensor Soap Dispenser controller to the 5.3 gallon (20 liter) sub-tank reservoir. The extra long 16.4 foot (196.85 in) length helps aid with sub-tank placement allowing for addition room if needed. This long lasting, durable and flexible hose is designed to work with TOTO Auto Soap Dispenser Spout 5.3 gallon (20 liter) sub-tank and Green Seal,oap. Vital component to connect the controller to 20 liter subtank to reservoir. Ensures proper function of the auto soap dispenser. Aids with location modification if you need additional length for installation. 16.4' length. Included: Connection hose only