Tecnoseal R4MG 5 in Magnesium Marine Rudder Anode

The Tecnoseal R4MG is a 5 inch magnesium rudder anode that bolts to the rudder blade. It stands 0.60 inches tall and weighs 0.78 lb. Rudders are a common spot for corrosion, especially where the stock and blade fittings meet.

Magnesium is the most active anode metal and is meant for fresh water only, since in salt water it overprotects and wears away very quickly. Each anode comes with a stainless steel hex nut and socket cap screw, and the hex nut is captive, which makes installation much easier underwater. Tecnoseal makes these at full size and weight for maximum service life. Fit on this version is tied to the 5 in measurement, making a quick check of the existing installation worthwhile.

An anode is a sacrificial metal that corrodes in place of your drive, propeller and other underwater metal. Stick with one anode metal on a given drive or hull instead of mixing zinc and aluminum. Match the alloy and mounting dimensions to the existing anode before replacement, because both details affect protection and fit. Browse more marine anodes.

• 5 inch magnesium rudder anode
• For fresh water only
• Captive stainless hex nut for underwater installs
• Full size and weight