Fits Volvo SX and SM Zinc Anode Kit By US Marine Products US Military Grade Replaces CMSXKITZ 20708 Replaces 3855411 Volvo Penta SX/DP-SM Outdrive Gearhouse Zinc Anode 3854130 Volvo Penta SX/DP-SM Outdrive Transom Shield Zinc Anode Mounting hardware included. Zinc is for salt water use.