2-Ear Pinch Clamp, Stainless, 0.787 - 0.905 Inch Clamping Range, 0.354 Inch Width

Close one ear all the way first, then move to the second ear. When you close that second one, the first ear should open back up just a little, roughly a 1/16 inch gap. That slight spring-back is actually what you want. It builds tension into the clamp so it can flex against vibration, pressure changes, and hose shrinkage over time. If both ears close all the way with no gap at all, that's a sign the clamp is too big for the hose you're working with and you'd need to drop down to the next smaller size.

You want the hose outside diameter to land in the clamp’s clamping range of 0.787 to 0.905 inch. The nominal size is 0.875 inch, so a hose that’s about 7/8 inch OD is right in the window.

These Oetiker 2-ear clamps are best installed by fully closing one ear first. Then, close the other ear, leaving a small gap of about 1/16 inch. This creates a spring-like action for a secure hold against pressure, vibration, and hose shrinkage.