This Kyosho RC Surfer 3 Stern Tube Set is a crucial replacement component designed to maintain the optimal performance and integrity of your RC Surfer 3 model boat. It provides a sealed, low-friction passage for the propeller shaft through the boat's hull, ensuring smooth power transfer from the motor to the propeller while preventing water ingress into the electronic compartments. Constructed from durable, marine-grade materials, likely a combination of robust plastic and possibly brass bushings or an inner liner, this set is engineered to withstand the demanding conditions of RC surfing and restore the model's original watertight performance and efficient propulsion.