Looks like a autotopoff.com to me that's what I have on my system and it works sweet! All you would need is whatever tipoff pump you want I use a brs 50ml dosser pump
Yeah I have the two switch one but the first switch has never failed me in the 4 years I've had it.
It will turn on the outlet when the water drops below the set level and then kills the power when it's full great top off in my opinion.