There are not many cheap check valves at the hardware shop. Since I'm only testing some pump application, I need to have lots of low medium pressure check valves. Here's a cheap way to make one.
Items needed :
1. 3/4" PVC coupler
2. 3/4" to 1/2" PVC reducer
3. Approx. 1" long pin (see diagram)
4. Few glass marbles
5. PVC pipe glue
Follow the steps or please download the original image for bigger viewing and reading.
The commercially brass type check valves are better for prolong usage. This DIY cheap check valve is only for my testing purposes. Any DAMAGES/INJURIES/DEATH due to this design, I'm not responsible.
Thank you for viewing.
Insert glass marble into the 3/4" side of the reducer. Smoothen he inside of the pipe if the marble doen't fit. Test the airtightness by blowing or immersing in water. Test a few marbles and choose the best.