The quiet-closing gate stop is the ideal gate alignment device for preventing hinge, latch and gate damage, and for prolonging gate life.

This simple, convenient device is molded from high-strength (glass-fiber reinforced) polymer materials and is guaranteed against rust, distortion and staining. An intregrated rubber buffer protects against "gate slam" and helps reduce noise significantly. The benefits of this are increased hinge and gate life and a less-frequent need for gate adjustment or re-alignment.
http://www.magnalatch.net/gatestop.html
tak jak "door stop"