1/4" 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.

Bought a package of two, only one worked properly

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.

Everything excelent