Sierra 18-6012 Mercruiser Zinc Trim Tab Anode Sierra high-quality replacement anode for Mercruiser Stern Drives. For Use On RMRAlpha One Sterndrive Transom Assembly 1983-90 And Prior Drives, Alpha One, Gen II 1991 up. Material Zinc Will not work with Black Max or other high rake propellers Interchangeable with GLM 12740 Mercruiser Stern Drive 34127A1 34127T2 34127A2 34127 34127T1 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type En