Every second year the disc stack should be changed. The needed part are included in this kit. Alfa Laval kits are designed to help you conduct planned service in as little time as possible. They include what is required for every specific service as described in the manual and the most up-to-date genuine spare parts, to extend your equipment's lifetime and ensure it is running on the latest technology. All parts are specifically designed to match your equipment and operating conditions – the perfect fit and compatibility for your equipment. Service Kits are sent in one shipment. You can be assured of the right parts in the right packaging with the right fit and the right instructions. For detailed service instructions please refer to your separator manual.