91555-ZZ0-M00 P.T.T Relay Collar - Overview. The 91555-ZZ0-M00 P.T.T Relay Collar is a crucial component within Honda marine engine systems. It serves as a protective collar for the Power Trim and Tilt (P.T.T.) relay, ensuring secure mounting and reliable relay operation. This part is engineered to meet precise factory specifications, guaranteeing seamless fit and long-lasting durability. By maintaining optimal mechanical alignment and protection, it helps prevent relay damage from vibrations an