IME, you dont want one of the CPR versions...
They are the most fallible of the two main designs for overflow box.
You want one that has a u-tube siphon...
They require manual siphon to start, but the last time I had to start mine was well over a year ago.
I have one available.
60$ shipped.
It serviceable but somewhat weatherworn from years of good use.
I will ship if you're interested.
Make sure you do some research on which design is best for you.
some are more quiet than others for example.
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