This quick-flushing unit fits most standard outboards and I/Os with a side inlet vent. Installs in seconds with an ordinary garden hose. No tools required. Lengthens engine life by flushing out salt, sand, and corrosive chemicals in minutes. This flusher works with 200, 250, 270, 280, and 290 Horsepower Volvo Engines from 1969 to present. All other Volvo's need to use the rectangular motor flusher, item 23809.