Masterkleer PVC Tubing 11mm ID, 16mm OD (7/16" ID, 5/8" OD), 3.3 Meters (10 ft), Black UV Highly flexible PVC tubing for water cooliing Inner Diameter: 8mm (7/16") Outer Diameter: 11mm (5/8") Maximum operating pressure: 30psi (~2.07 bar) Operating temperature range: -42.8C to 73.9C