Virtually all rubber hose compresses (cold flow) after installation of clamping device, resulting in an almost immediate torque loss that can exceed 80% of installation torque. Similarly, virtually all metal connections expand as a system heats up, and then contracts as the system cools. Conventional worm gear, T-bolt, and other clamps are passive, in that expansion or contraction of components cannot be compensated for with out re-tightening or loosening the clamps. This clamping system is an ?active? clamping mechanism, which monitors and then compensates for the changes by actually changing diameter through a unique worm gear Belleville assembly. 3 Year Warranty. Min 2-1/4" Max 3-1/8"