Solenoid for Ro/Di

[emerald crab]

When you buy the power supply 115V AC to 24V DC make sure the maximum capable load of the power source is higher than what the valve takes. You might be better of just buying a 115VAC valve and replace that one.
Just a reminder, in the solenoid valves the plunger and the spring are metal (some sort of stainless-a chrome nickel alloy). The RO water is slightly acidic, so you want the valve installed on the raw water side, not on the RO side.