Midland Metal 842010 Constant Torque Hose Clamp, 9/16 in Minimum Clamp Diameter, 1-1/16 in Maximum Clamp Diameter

After install clamp was tightened to spec. Solid feel and tightened around vinyl hose evenly. On 1 the next day, clamp was loose so re-tightened and no more leaks in a week with 20 degree temperature swings between day and night.