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

My soap dispenser is working again! The piece that came with my soap dispenser kit eventually wore out.

If you are confused on which direction is in and out don’t try blocking through with mouth! I used a 3/8 piece of rubber hose adapted to a water line to test because I couldn’t blow through with my mouth 👄, wide side in small side out 😊

It would be great to know about how much pressure is required for check valve to open. This check valve requires a lot of pressure to open. Unfortunately, I cannot use this for what I would like to use it for.

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.

I needed a check valve between the fresh water tank and water pump in my RV. Hooking up to park water, through a pressure reducer, allowed water to overfill the tank and dump water out of the vent/overflow hose. Why Keystone didn't install one I'm sure was just saving a dollar hoping the pump diaphrams would suffice. I first did the "blow test", blowing thru these plastic valves one way and confirming I couldn't the other way. Both passed that simple test so I installed one. The first time I turned the pump on the valve "disassmbled" itself. I retrieved the pieces and spring from the hose and opted to not even try the other one, both returned.

These are the real deal and they really work in your automotive windshield washer lines.

So for my purpose, they took too much pressure to open. My purpose was a really low pressure application. According to the specs, they should open. The spec advertise a lower opening pressure than other valves I have used which do open ok. So the opening pressure may not be as advertised, but they seem to be good solid valves, as long as your application has the water under a bit more pressure to open the valve.

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.

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.