CerroPureâ„¢ nitrogen-charged ACR tubing can be used for air conditioning and refrigeration. The tubing meets the maximum allowable residue limit of 0.0035 grams per square foot of interior tube surface area, as listed in ASTM B280, the company says. The seamless copper tubes are delivered sealed and pressurized with nitrogen gas. They are available in lengths of 10 and 20 feet, in 3/8- to 3-1/8-inch diameters. According to the manufacturer, this tubing is available in annealed (soft) coils or drawn (hard) straight lengths.
Cerro Flow Products Inc., P.O. Box 66800; St. Louis, MO 63166-6800; 888-237-7611 or 618-337-6000; 618-337-6958 (fax); www.cerroflow.com.