Double circuit aluminum cold plate with two lines of 18 feet each of embedded 5/16" O.D. x 1/4" I.D. stainless steel tubing for maximum cooling efficiency. Specifically designed for the correct resistance in a beer system: 18' of 1/4" stainless steel tubing equals 21.6 lbs. of resistance. The stainless interior won't corrode and is easy to keep sanitary, while the outside has a smooth, easy-to-clean finish. Fittings are not included and must be ordered separately.