Water level control valve - GIF

Water level control valve.

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Previously:

https://www.homemadetools.net/forum/...825#post156223
https://www.homemadetools.net/forum/...803#post152335
https://www.homemadetools.net/forum/...296#post146227

I'd worry hanging it from a hose that it would fly around, guess the output pipe is big enough to lower the "thrust".

I made something like that for a guys outdoor pond. He went on business trips for a couple of weeks to a month and while the fish had plenty of food the pond level would drop a lot. Worked great for years the last I heard.