12 volt Solid State Rectifier -  The original plate-type rectifiers fitted to most British bikes are prone to failure due to vibration & corrosion. Solid state electronics offers a more robust solution with improved long-term reliability. This unit is a direct replacement for 12 volt single phase plate type rectifiers. Compact size (approx. 27mm x 27mm) allows for easy positioning, which should be on a small heat sink to aid colling using the central mounting hole. Connection is straightforward.