Choose the model Zinc fin anode 50/90 HP Aluminium fin anode 50/90 HP Zinc fin anode rightward bend 100/220 HP Aluminium fin anode rightward bend 100/220 HP Magnesium fin anode rightward bend 100/220 HP Zinc fin anode counter-rotating left 100/220 HP Aluminium fin anode counter-rotat. left 100/220HP Magnesium fin anode counter-rotat. left 100/220HP