SS-3-DP4 Hydraulic Steering Lock for Outboard Motors The T-H Marine 4 Hydraulic Steering Lock is engineered to enhance control while trailering outboard motors equipped with hydraulic steering. This innovative design locks the steering in place, preventing unnecessary movement and ensuring that your outboard motor remains centered during transport. Easy to install and remove, the Steer Stop features a convenient grip for hassle-free operation and includes a cord to keep the units connected for storage.