Water-cooled frequency control to control a 3-phase pump. The controller can be put in series with other identical devices to control up to a maximum of 4 pumps. The controller is digitally adjustable from 0.5 to 12 bar. Maximum 14 Amp, The Speedmatic 1305 and 1309 have a 1.1/4" connection and a maximum flow of 15m³/h, the Speedmatic 1314 has a 2" connection and a maximum flow of 25m³/h. Supplied with dry run protection and built-in thermal protection