Stepless Spring Clamp For Thermal Cycle Applications, 2.375 - 2.75 Inch Clamping Range, 0.35 Inch Width

It's designed for hoses with an outside diameter between 2.375 and 2.75 inches.

Fit comes down to the clamping range, and this one covers 2.375 to 2.75 inches. A hose sitting around 2-1/2 inches falls inside that range, so it is the right size range for that diameter.

Low installation torque is one of the things that makes this clamp a good fit for silicone hoses. The torque range runs 12 to 18 lb-in, which keeps stress on the hose material low during installation. The spring action also means it adjusts continuously as the hose expands and contracts with heat cycles, so you're not dealing with a fixed clamp that either loosens up or bites in too hard over time. Just make sure your hose falls somewhere in the 2.375 to 2.75 inch range before ordering.