We bought a fill valve when we built our pond and then, well, we forgot to install it! By the time we realized it, it was too late. So it's been in our garage for six years, still in the box. We paid $80 for it, I'd sell it for $30 plus shipping.
Looks like this:
Here's the specs:
https://www.aquascapeinc.com/upload/Hudson_Water_Fill_Valve_Instructions_FINAL_6-06.pdf
Looks like this:
Here's the specs:
https://www.aquascapeinc.com/upload/Hudson_Water_Fill_Valve_Instructions_FINAL_6-06.pdf