Stepless Ear Pinch Clamp, Stainless, 0.425 - 0.524 Inch Clamping Range, 0.276 Inch Width

For low durometer or thin-walled hoses, this clamp is a good choice. It works well with silicon, vinyl, and polyurethane lines in particular.

Soft, thin-walled hose is exactly what this clamp is built around. The inner band is smooth all the way around, so it won't bite into or deform the hose material the way a traditional worm-drive clamp can. It's well suited for silicone, vinyl, and polyurethane lines specifically, and the tongue-in-groove design wraps a full 360 degrees to give you an even, consistent seal rather than a pressure point at the screw housing.

Start with the tubing outside diameter and match it to the clamp’s clamping range of 0.425 to 0.524 inch. During install, you want the ear pinched down with about a 1/16 inch gap left, since that spring-like tension is what helps it keep holding as the hose sees pressure, vibration, and temperature changes. If you can pinch the ear fully closed, the clamp is too large and you should step down to the next smaller size.