Features: Independent engine tilt for multiple engine installations upgrade over baystar and mechanical steering - easier to steer Can be used with all SeaStar hydraulic steering boat helm pumps Seastar #39;s innovative sealing system provides resistance against the harsh outboard environment The new SeaStar stainless steel adjustable o-ring fittings make for easier installation Specifications: 8.34 Cubic inches in volume capacity 1.375 bore dia HS5157 SEAL KIT