The NL3621 sacrificial anode kit is designed to protect the lifting systems of bathing platforms and tender supports on boats. Compatible with NOVAL aluminum lifting columns, this kit includes four rectangular anodes and eight A4 M6x16 TCHC stainless steel screws. Technical documentation accompanies the product to facilitate installation and maintenance, which is possible directly from the water on three-stage systems. Anodes should be inspected annually and changed every 12 months, depending on the sailing environment. When parked for long periods, lowering the platform and placing it in contact with the water will limit galvanic corrosion of the system.