Netafim Alex-Tronix Backflush Controller 4 Station 24VAC/12VDC/12VDCL (23AXF4ACDC-D)2 4 8 Station F Series Filter Backflush Controller Product Overview and Features Standard features include a pressure differential switch, flush time setting and dwell time setting. Quick and easy programming. Some controllers have counters and alarm settings. Two Year Warranty Resetable backwash count Periodic, manual, or pressure differential actuated Accurate timing Output selectable to operate 24 VAC, 12 VDC, or 12 VDC latching solenoids Pressure