Feature:1. Part Number: According to the original factory specifications, outboard trim tab anode block replacing OEM number is 822157T2.2. Applicable Model: Trim tab anode fits for Mariner Force 2550 HP 2 stroke and 4 stroke outboard lower units from 19972006.3. Sacrificial Anodes: As a first line of defence an anode is meant to corrode instead of your engine. Anodes can be easily replaced and can protect your engine against costly damage.4. Outboards and Stern Drive: Helps protect the gear case housing from erosion, as it provides hydrodynamic trim force to your outboard and stern drive to aid steering.5. Premium Material: Made of zinc alloy, anti oxidation, anti rust, resistant to seawater environment, suitable for use in saltwater and freshwater environments.Specification:Item Type: Trim Tab AnodeMaterial: Zinc alloyReplace OEM: 822157T2Fitment:Fits for Mariner Force 25-50 HP 2 stroke and 4 stroke outboard lower units from 1997-2006..Package List:1 xTrim Tab AnodeNote:1. Please double check the part number of your item, matching information is for reference only.2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!