Quick Aquacontroller question

My question is, how far can I submerse the probe? And there is a solid black plastic piece that looks like it could be a cap on the end. I am not supposed to remove this right?

Thanks for the help!
FB

You can submerse the probe partially or fully, but the cable may become brittle after being fully submerged for long periods of time. The rubber cap must stay on, or you will damage the probe.

That is out of the unofficial apex manual.

http://reeftech.webs.com/

I and many others run their probes fully submersed with zero problems.
 
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