Heavy-duty and innovative counterflow chiller with all-metal construction and large-diameter convoluted tubing.This chiller is the ideal upgrade if you're tired of waiting for your immersion chiller to do the job. Also great when doing larger batches, where an immersion chiller may be simply impractical. Counter-flow chilling is very efficient, saving water and time. All copper construction maximizes thermal conductivity.Works great with a pump or being gravity fed.