BA 150-7Tm Inboard Hydraulic Cylinder | Seastar HC531A Seastar BA 150-7TM Inboard Hydraulic Cylinder HC5318 Inboard hydraulic steering cylinder works with Seastar Solutions & Teleflex marine hydraulic steering helms to provide smooth, fatigue free steering. Teleflex inboard hydraulic steering cylinder BA 150-7TM model For single or dual rudder inboard powered boats Two axis articulation Cylinder is supplied with bleeder fittings Brass 1.75 in. cylinder body diameter with .625 in. shaft diameter Includes ball joint