Check Valves... Where to get them?

I have a small see through one here, but don't know where to get those from.


Savko as the ones like PA, but a lot cheaper. Still was not thinking they would cost that much. wow.
 
I'd check GWA first. Lowe's aren't see through. That would be nice so you can see if it's sticking before a problem. I'm not sure I'd pay 80 bucks vs. 5-10 bucks though.
 
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