UFlex UP18 Front Mount HelmThe Uflex UP18 is a front-mount hydraulic helm pump specifically designed for use with the UC81-OBF cylinder. It features a 5-piston design delivering a displacement of 1.1 cu in (18 cc) per revolution, ensuring reliable and consistent steering response. The helm includes a built-in lock valve to maintain positive rudder positioning and an integral relief valve for over-pressure protection.Engineered for durability and serviceability, the UP18 incorporates a 3/4" tapered stainless-steel shaft, two 1/4" NPT hydraulic fittings, and a corrosion-proof composite housing. The lock valve and shaft seal are also easily accessible for maintenance.Feaures Built-in lock valve for positive rudder lock; Integral over-pressure relief valve; 3/4" tapered stainless-steel shaft; Includes two 1/4" NPT fittings; Corrosion-resistant composite housing; Easy access to lock valve and shaft seal for service; Designed for use exclusively with UC81-OBF cylinder; Specification Mounting: Intermediate; Displacement/Revolution: 18 cc- 1.1cu.in; No of piston: 5; Max. wheel diameter: 508 mm (20"); Weight: 3.6 KG (8 lbs);