KIESEL - 5999/2017 referenced mechanical seal product produced by high technology. You can ask all the codes and references except 5999/2017 too. 5999/2017 referenced product which is satisfy the customer's needs, offers advantages of quality and cost. It produced result of tests of laborotory for years. 5999/2017 referenced product is an original piece of your foundation or machine, original parts makes your machine live longer.