I wanted to share some photos and gather other people's valuable input into a problem that I am having trying to seal the electronics tube. I have a 2.5 version ROV and end caps. After going through the forums and looking at a how-to video on how to properly seal the end caps, my electronics tube is still leaking.
My test setup is the empty tube, plunger in one side and vacuum pump on the other, just as Eric describes on this discussion I pull a vacuum 50-60 kPa on the vacuum pump and then submerge it in a container.
I started with just a single layer of teflon tape and then in followings tests increased to three layers, but I am still getting leaks in the tube :(
In my last test, it looks like the water is coming in between the teflon tape and the end cap. I'm wondering if the cracks on the end cap are allowing water in via capillary action.
Above: Two leaks at the top
Above: Another leak on the side
Above: Cracks in the end cap