For contacting conventional 2-way rockers with center position. For use in the surface-mounted housing from ocean. Support ring included for the following programs: Busch-Duro 2000® SI/SI Linear, Reflex SI/SI Linear, future® linear, alpha, solo®, Busch-axcent®, carat® and pur stainless steel. The bus connection is made via the enclosed bus terminal. From ETS4: Commissioning via native ETS application