Provides more predictable handling characteristics while retaining the benefits of the off-throttle O.P.A.S. system. Precision-machined composite collars prevent the O.P.A.S. fins from dropping when pump is out of the water in choppy conditions. Installs quickly and easily without tools. Compatible with RXT-X, RXT, GTX-SC, GTX 4-TEC, WAKE-SC and Wake models only.