The Dometic SeaStar HH5281-4 Rear-Mount 1.7 Hydraulic Helm Pump with 1" Shaft is the world's most popular hydraulic boat steering helm. It offers smooth, efficient no feedback steering for inboard and outboard applications. Provides super-efficient steering for today's high-performance hulls with single or multiple outboards up to 700 HP combined. It's the OEM choice for center consoles, cruisers, and more. This latest series of SeaStar helms has been redesigned to provide a better experience for the vessel operator. New valve technology ensures tighter, quieter, and more responsive steering, while minimizing the potential for chattering when dealing with over running steering loads. More durable check valves make the entire steering system more resilient to the rigors of trailering. The revamped design enhances their aesthetics and has introduced a new fill port plug design for easier maintenance. The HH5281-4 model is a direct replacement for the HH5281-3 and HH5281.• Greatly reduced chatter noise that's typically generated by over running steering loads• Improved check valve durability with a more robust design• Better trailering performance as well as longer service life• Eliminated flow noise when coming off hard-over position• Decreased clicking sound of the lock valve spool during steering reversal• Tighter, more responsive steering resulting in better "regrip" performance• Full compatibility with existing SeaStar hydraulic steering systems• Compact helm• Standard 3/4" tapered steering shaft• Accepts wheels up to 28"• Small 3.0" hole cutout in dashSpecsModel: HH5281-4Displacement: 1.7 cu. in. Helm Type: Rear Mount Minimizes potential for chattering when dealing with over running steering loads More durable check valves make the entire steering system more resilient New fill port plug design for easier maintenance | Dometic HH5281-4 Rear-Mount 1.7 Hydraulic Helm with 1" Shaft