This hydraulic helm is a std 20 CC / 1.2 Cu Inch helm with compression style fittings. It is used with the 8M0054993 Basic cylinder. The shaft is anodized steel with a composite tank. The pressure relief is 1000 PSI for high torque applicactions for improved performance. (5.2 Lock to lock wheel turns).. Fits:. Single engine 75-150 HP (includes new 150 HP 4 Stroke)