I’ve done some testing with those. Used a cap on one end and the threaded fitting on the other. Put a few cups of flour in it to serve as a water detector. Buried it for a couple weeks in an area slightly above the water table.
The pipes kept the water out but there were traces inside tube. I think from the air trapped in the tube. I plan to use some desiccant, a well lubricated gun, and these bags.
Grease that weapon down and you will have no problem.