I don't know where you can get an ultrasonic level transmitter but I use the same type of switch that you have pictured.
I use it with my ATO. I cut a hole in the top of plastic bottle cap and pushed the wire end through the hole in the cap and secured it with the plastic nut. I then thread the wires through a hole I made in the plastic bottle then screwed the cap on to the bottle. The bottle is upside down and secured to the side of my sump at the correct level for my ATO.
This way the wires are always dry inside the plastic bottle. Haven't failed me yet.
I hope you can visualize it without pics.
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