1/2 inch mini ball valve

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I have one on my little tan pump, so far no problems. Just be aware that it is not full bore.
 
I use those as vents to prevent a siphon when disconnecting my plumbing lines. I had problems getting them to seal. I tried over wrapping the threads with Teflon tape and really wrenching them down. And it still leaked. Not much just enough to be annoying. Now they seamed to have sealed themselves up.

FYI, bargain fittings has them for less, but there's $5 shipping:
https://www.bargainfittings.com/index.php?route=product/product&path=36_57&product_id=281
 
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I tried those and they restricted the flow of the little pumps down.

BTW I believe these were only like 99cents on aliexpress
 
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