ACOL (Shanghai) Online Controls Co., Ltd. is a manufacturer of various flow switches, differential pressure switches, safety valves, auto filling valves, automatic air vent valves, expansion tanks and some other air condition parts, with well-equipped testing equipment and strong technical force.With a wide range, good quality, reasonable prices and stylish designs, our products are extensively used in HVAC systems and the promotion of the environmental industry and other industries.Our products are widely recognized and trusted by users and can meet continuously developing economic and social needs.We welcome new and old customers from all walks of life to contact us for future business relationships and achieving mutual success!