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This anode fits sail drive units SD-20, SD-30, SD-31, SD-40, and SD-50.
The stainless steel adapter kit is required when you change from a solid to a split ring anode.
Each adapter kit includes 4 (M-6) Allen flat head machine screws and 2 (M-8)
• Split-ring sail drive
• Galvanized steel mounting core
• 122 mm center to center; screw size is 8 mm
• Conforms to Mil Spec MIL-A-18001 for maximum protection
• Made in California, USA