The Hayward AC Relay Kit, aql-relay-ac-kt, is perfect for use with Pro Logic or Aqua Logic p-4 and ps-4 models. Up to two aql-relay-ac-kts can be used with the ps-4, providing an on/off output capable of handling up to 3hp at 240vac. Configure valve3/4 for manual on/off, countdown timer, timeclock, solar, in-floor cleaner, group or super chlorinate.