ATS-GDS Replacement Control Box.
REFURBISHED AND TESTED. 
Features:- LED Visual & Audible Alarms- Monthly Countdown Timer- 30 Day Replacement Alarm- UV Lamp out Alarm- Shutoff Solenoid Valve Connection (solenoid sold separately) - Build in Surge Protector - Replaceable 3 Amp Fuse - Splash Proof Plastic Injection Molded Box Direct Replacement for EV, GDS, and PFC Series for 8GPM, 12GPM and 20GPM (gallons per minute).