This reliable auxiliary water level sensor is specially developed for EC series excavator equipment. It accurately checks the residual volume of engine auxiliary cooling fluid all the time. It can send out timely reminder signals once liquid level falls below standard range. This part effectively avoids engine overheating faults brought by insufficient coolant supply. With excellent waterproof and anti-shock performance, it keeps stable working state in complex field environments. Made in line with original factory technical standards, it features high detection accuracy, simple installation and long service life for routine vehicle maintenance.