91557-ZW1-701 Orifice Collar - Overview. The 91557-ZW1-701 Orifice Collar is a critical component within Honda marine engine systems. It functions as a precision restrictor or control point for fluid flow, helping to maintain stability and efficiency throughout the marine propulsion mechanism. Designed for seamless integration, this part supports the power trim-tilt system by regulating fluid dynamics, which is essential for smooth engine operation and reliable performance on the water.. Key Fea