BBTUS 1/8" 3/16" 1/4" 5/16" PA66 Automotive Oil Line Spring Check Valve, Car Fuel Vacuum Check Valve, 2 PCS High Temperature and Corrosion Resistance one-way Oil Pump Check Valve (1/4" long)

I bought these to use in line with tubing which goes from the sink soap dispenser pump down into a container of dish soap which sits in the sink cabinet. Without the check valve I could get the tubing primed and it pumped a little but once I stopped using it the soap slowly dropped back down into the soap container. But with the check valve installed the soap stays in the tubing so that whenever I press the soap pump handle I get dish soap dispensed. It removed the difficult task of trying to fill the soap dispenser bottles which were screwed up under the sink. The bottles are no longer under the sink - just tubes running down into the larger dish soap bottle which is very easily replaced. I realize that this was not the original intent for these check valves but they work well for my use which I found from a kind soul who posted a video on YT..

I used this for my soap dispenser in the kitchen work like a charm no need to keep pumping as this keeps the liquid soap from going back down

using it to pump soap up to my kitchen sink. Work great with dish soap.

Very easy to install. Used in dishwashing soap dispenser.

Bought for soap pump dispenser and is working well.

Very satisfied. The valve works as it should and installation was uneventful.

Great value for the price! Fast shipping