Why the TRICON®/S Register? The TRICON®/S register mounts on the meter maincase. The bayonet-type mount allows the TRICON/S to be easily retrofitted to many existing Neptune meters without interruption. The TRICON/S can be used in applications where a switch closure that is proportional to the flow rate is required. Several switch configurations are available. The TRICON/S register is ideally suited for controlling/monitoring total flow rate data such as water softening regeneration, demineralization reverse osmosis, chemical treatment/injection, batch processing, filtration, boiler feed water make-up, cooling tower water make-up, and irrigation.