91555-Zz0-M01 P.T.T Relay Collar - Overview. The 91555-ZZ0-M01 P.T.T Relay Collar is an essential component within Honda marine engine systems, specifically supporting the Power Tilt and Trim relay function. This collar acts as a critical electrical connection housing for the relay that controls the Power Tilt and Trim system, which is vital for the smooth operation and positioning of your outboard motor. Designed to integrate seamlessly with the existing marine engine setup, it ensures reliable