I am trying to replace a rheostat fan control. I have found on the internet a Lutron FS-5F-WH Rotary 5-amp single pole fully variable fan control which looks like exactly what I need but the "single pole" is throwing me as I believe I need a 3 way as there is another switch (toggle 3 way) down line in the circuit. But I cannot find the same type switch that says 3 way. help.