Install the Battery Operated Controller with 1" Anti-Siphon Valve above the ground and above the sprinkler line to prevent water from back siphoning into the water supply.
The C216 (DIG model 710-100-ASV) is a one station, heavy duty battery operated controller with 1" plastic anti-siphon valve. Used for drip irrigation or sprinkler systems in residential or commercial applications, this controller features a large LCD display with four buttons to program. It has complete water proofing capability and comes with a rain sensor connection.
The controller operates using one, nine volt battery that can last for up to one year (DIG 700 series). An anti-siphon valve is used to prevent contaminated water from being siphoned back to the main water supply. This controller should be installed 8” to 10” above the ground and above the sprinkler line to prevent water downstream of the valve to back siphon into the water supply. The C216 should be operated in a pressure range of 25 to 120 PSI.