Quickun 5/32" One Way Inline Check Valve, Non Return Hose Barb, Ozone Resistance Plastic Valve for Fuel Oil Water Gas Pump Air, 2 Pcs

Perfect for preventing backflow into the bucket of bleach from the backstream injector I use with my power washer. These are cheap but effective check valves for use with 3/8" tubing.

work great for dehumidifier pumping to drain. Keeps water from back feeding

I have a small fountain that is automatically filled with water from irrigation. Needed something to keep it form siphoning water back into the irrigation system. May not last too long but, I have four more spares. Very happy with purchase.

These valves take a bit of pressure to open. they were not as sensitive to opening pressure as i needed. but they are quality pieces.

I bought 2 packs of these (so 4 check valves total) and 2 of the 4 have pinhole leaks in the middle of the body section (not the ends where the hoses connect, but in the solid plastic part). Obviously for $6 these aren't super high quality, but 50% failure is pretty bad.

Of course, when you read about it being ozone resistant, one thinks this could be good for using on a spa to prevent back-flow from the ozone supply to the water injector. Sadly, one thing that's VERY difficult to obtain for this product, is the amount of pressure required in order for the gas to flow in the proper direction. With respect to a spa ozone maker, that amount of pressure it can produce is insufficient to cause this check valve to open. I bought the five pack thinking they would be perfect but for me, they're useless.

I tested these prior to installing by blowing through them. That was the only way to determine the direction of flow. It takes fairly good pressure to open the valve and there was no backflow at all (I was preventing siphoning). I carefully heated the rubber hose prior to installing and that made inserting the valves much easier.

Bought these to allow excess crank pressure out of my crank case while also keeping any vacuum for necessary operation. So far I’ve only started the bike and let it run but have not gone for a ride, but it seems to be working as intended.

Were smaller than anticipated, but could be also slightly difference in pipe size

Great little valve

Check out my picture. The hours is 3/8" ID (see labelling on hoes). Compare to labelling of the package these came in and the one connected to the hoes. 🤨

Bateaux

Worked perfectly for my purpose. Only problem is that it's not marked which direction it should flow and a check valve only works one way. I just blew through each opening to figure out which direction would prevent air from going through before installing it.