Feelers 1/2" (12MM) One Way Inline Check Valve Non-Return One-Way Air Water Gas Check Valve Ozone Resistance PVDF, Pack of 2 2PCS

This works well for a soap pump line. It keeps the line primed and ready.

05 Rockwood. When I would turn on city water. Water would pour out the back under neath overflow. The water pump for the holding tank has an internal check valve that failed so I put this in the line and fixed it.

The price is really good for the amount of them you receive but the the quality definitely shows for the price you pay. So if you want something more durable I recommend spending a few more but if you looking for a quick fix and quantity then this I definitely recommend:)

Not able to use in my hot-tub ozone intake. The suction needed to overcome the spring force of this directional valve was more than my system could provide. This valve wouldn’t allow ozonated air to pass. My spa uses a small 1/5 hp circulation pump that has very little suction. This one-way valve would not flow. It took all my breath to operate this valve. Valve appears to be good quality. Just not good for my application. I kept the valves but if I had know there suction requirements, I would not have purchased them.

NOT suitable for ozone injection systems. Disintegrated after 6 months of use on an ozone injection system for a residential water softener.

Bought a two pack. One of the two check values didn't work and I couldn't get the value to open. Amazon refunded. The valve also requires a lot of pressure to open. Probably works fine if you have it hooked up to a high pressure pump/line but the small aquarium pump I used (70 gal/hr) didn't create enough pressure to open the valve.

One way valves for my rv water pump and street inlet water both malfunctioned, meaning water could travers both directions. Putting these in line on both hoses solved the issue, and saved some money in doing so. Pump work fine, believe stilling in the Texas hot sun damaged the one-way valve.

Used to replace an "OEM" one in the spa ozonator line going to the venturi tee. Been working for a month. Not sure if better than name brand or not, or why original failed. Regardless, I reconfigured it as per the ozonator mfr recommends [ozonator>check valve>Hartford Loops>tee]. It was installed originally [ozonator>Hartford Loops>check valve>tee]. The tee was also right above the valve, so maybe the chlorinated water dripping down affected the check valve and caused it to stick closed.