Thanks for all the pointers. Pressure release valve is standard with most; don't know why there are even any without one.
Drying is not an issue. I use it if not every day, certainly every other day.
Too bad there are no specific manufacturers, brands, models mentioned, and why they are good. I think any sprayer where you have to twist the pump handle to open the reservoir is bad. It is often not easy to figure out from the picture how the unit is opened.
Looked at tractor supply, none in that price range, and some look like the bad handle-twist kind.
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