Check Valve, 2 Pieces 3/8" 10mm Inline ABS 1 Way Water Non Return Check Valve for Fuel Gas Liquid Air
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Low pressure valves like these are used for emergency applications. They will probably blow them out if you put 3 pounds on them. 30 pounds of pressure just blew them out right away. I was going to use them on my motorhome pump. I found that these are very low pressure valves when I did my research.
There is not much space in this unit. The inside circumference of the tube is 3/8 inches, and they have fittings with this size. It is likely to work if your tube is that size. You can find out where your local aquarium store is.
I would not recommend this. Then at what volume would 69 psi be heard? There is a possibility for the internal components to crack. It seems that plastic construction would be most suitable for low pressure and low volume. To prevent back siphoning on a drain tube, I place mine in a line.
Although I have not tested it, it seems to open with very little pressure. During the installation of turbo systems, we use them to check PCV check valves.