Feature:1. OEM Number: Replacing manufacturer part number for reference is 822157T2. Please make sure the OE number matches the part you are replacing.2. Fitment: Trim tab anode is a good replacement for Mariner 2550 HP 2 stroke and 4 stroke, and Force outboard lower units from 19972006.3. Function: Boat motor trim tab anode is used as a sacrificial anode to protect propellers, struts, bearings, etc. from underwater electrolysis.4. Advantage: Trim tab anode is a great way to protect your engine from damage, and timely replacement of anodes, reduce maintenance costs.5. Aluminum Alloy Material: Made of high strength aluminum alloy, trim tab anode is resistant to oxidation and seawater environments, and it is also durable in saltwater environments.Specification:Item Type: Trim Tab AnodeMaterial: Aluminum AlloyApplication: Direct replacement of old or damaged anode blocks, anodes should be replaced when signs of corrosion appear to protect your engine from costly damage.OEM: 822157T2 Fitment: Replacement for Mariner 25-50 HP 2 stroke and 4 stroke, and Force outboard lower units from 1997-2006..Package List:1 x Trim 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!