Volvo Penta DP-H Magnesium cavitation plate anode.
If your anode is worn away by 33% or more, it is advisable to change it, as more of its surface area has been worn away and the remaining anode will wear away much quicker.
Please note this is a Magnesium anode for freshwater.
Volvo Penta Part No: 3588750
For: DP-H, DPH-A, DPH-B, DPH-C, DPH-D