You may have a hard time finding a more affordable counter flow wort chiller. These heat exchangers are one the fastest ways to chill wort and they can be easily and effectively flushed after use. Copper is a great conductor of heat, making it more efficient than a stainless chiller of similar design. These units are 9" in diameter and about 7" high. The input and output are approximately 3/8" outer diameter (9.5 mm). They can be used with gravity, but we recommend using a pump. Includes the Duotight fittings that will allow you to attach Camlock, QD, or garden hose fittings to the inputs and outputs, and enable you to control the flow rate at the water inlet.