Description For 3/8'' ID (1/2'' OD) corrugated tube. Recommended for fixed air heater, gas range, furnace, and water heater connections. Used with PlumbShop SD or RSD Series connectors. Tapped 3/8'' FIP thread. WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer, birth defects or reproductive harm and Butyl Benzyl phthalate (BBP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov