Tecnoseal Aluminum Split Collar Anode f/SD20, SD30, SD40, SD50 & SD60 Yanmar Saildrives

The Tecnoseal Aluminum Split Collar Anode for SD20, SD30, SD40, SD50 & SD60 Yanmar Saildrives is essential cathodic protection for any serious sailor running a Yanmar saildrive in saltwater or brackish environments. This split collar design fits directly onto your saildrive shaft, sacrificing itself to corrosive elements so your transmission and lower unit remain protected. If you've spent years maintaining a boat, you know that aluminum anodes are the unsung heroes preventing galvanic corrosion—the silent killer that destroys metal components from the inside out when dissimilar metals contact saltwater.

Tecnoseal's aluminum construction is engineered specifically for Yanmar's SD-series saildrives, offering superior electrochemical performance compared to zinc alternatives in modern alloy applications. The split collar design allows tool-free installation and removal without dismantling your drivetrain—a practical advantage when you're hauled out or at a mooring. At just 0.6 pounds with compact dimensions (4 x 2 x 5 inches), this anode provides adequate mass to ensure years of service life in typical cruising conditions, whether you're exploring coastal bays or making offshore passages.

Anyone operating an SD20, SD30, SD40, SD50, or SD60 Yanmar saildrive should inspect their anode annually, particularly if you spend significant time in saltwater. Replacement every 2–4 years is standard depending on water chemistry and boat usage—far cheaper than rewinding a saildrive or replacing corroded shafts. The Tecnoseal split collar anode (MPN 01305/1AL) installs directly onto your existing saildrive shaft, making it the go-to consumable for preventative maintenance on any serious cruising sailboat equipped with Yanmar's trusted saildrive system.