What's a good electric float switch

My tank is covered if I lose power, but If I lose siphon, my pump will keep going, and my DT will overflow. I'm looking for a good electric float switch to turn off the pump if this happens. I have a small tank so an inconspicuous one would be nice. Suggestions?

 

Bump! I'm a little confused on what I need. I don't want one of those big floats in my tank. I've seen switches that are small. Alls I want is a small float sensor or whatever so if the siphon fails, the DT tank will start filling, hit the switch and cut off the pump.

 

Anyone?

 

Here ya go

 

Sweet.. what do you hook that up to? AC adapter? Then how does the pump plug in?

 

If you do a google search for DIY ATO you will find instructions that you should be able to adapt pretty easy.