Uflex front hydraulic rudder pumps are available in three models with different displacements. The feature is that the ball bearing piston ring has a built-in lock valve to achieve reliable rudder lock. Ball bearing piston ring. Built-in lock valve. Integrated relief valve for overpressure protection. 3/4" tapered shaft. Cast iron rotor. 1/4" NPT connector for 3/8" pipe. Equipped with elbow connector. Can be replaced with Teleflex Seastar helmet. Maximum wheel diameter is 28". Pressure relief valve setting 70bar-1000psi Uflex front-mounted palm pump has three displacement sizes, which is characterized by a ball bearing piston ring, a built-in lock valve for positive rudder locking, and a standard 3/4" tapered shaft.