Geberit Sigma01 Actuators For Sigma Concealed Tanks, 2x6 and 2x4 InstallationsGeberit Sigma01 Actuators For Sigma Concealed Tanks, 2x6 and 2x4 Installations SIGMA01 ROUNDSIMPLE AND ECONOMICAL The Geberit Sigma01 Round actuator plate is offered in five distinct finishes. All come standard with water saving dual flush. Made of durable, high quality plastic, they are easy to clean and reasonably priced. Five color options, including new jet black and brass galvanized High quality molded plastic Dual flush built in Includes