2-Ear Pinch Clamp, Zinc Plated Steel, 0.276 - 0.354 Inch Clamping Range, 0.276 Inch Width

At 5/16 inch nominal size, that hose falls right in the middle of the 0.276 to 0.354 inch clamping range, so you're in good shape. The sweet spot with these Oetiker 2-ear clamps is having enough material to work with so the second ear doesn't fully close out. When you install it, close the first ear all the way down, then bring the second ear in until the first one opens back up just a hair, roughly 1/16 inch gap. That spring-like tension is what gives you a secure, tamper-proof hold against pressure and vibration over time.

Fit comes down to the clamping range, and this one covers 0.276 to 0.354 inch. It is also listed as a 5/16 nominal size, so a hose that lands in that range is what it is meant to clamp.

For best results, close one ear completely before adjusting the second ear. This allows the first ear to open slightly, which builds a resilient, spring-like action. If both ears close all the way without resistance, you might need a slightly smaller clamp size for the best fit.