The heat exchanger increases efficiency up to 25% by wrapping around a cook pot to capture heat normally lost to the atmosphere. Variable size adjustment; fits up to a 2-liter (7 in. diameter) cook pot. Thumb wheel adjustment for precision fit. Rolls up for convenient storage inside a cook pot. Weighs 6 oz.. . ?. . WARNING Contains brass, which can expose you to lead, which is known to the State of California to cause cancer, and birth defects or other reproductive harm. P65Warnings.ca.gov
