Does a completely enclosed tube need a pressure valve?

General Discussion
1

I will be building an acrylic tube camera that will be sealed at both ends before deployment (no cables exiting the unit, it will run on internal battery). I plan on using the 4" watertight enclosure system (https://bluerobotics.com/store/4-series/wte4-asm-r1/).

My question is, do I need a vent for this system? Both sides will be sealed with the clear acrylic endcap. Deployment will be shallow (less than 15 meters). If I do need a vent, any suggestions on how to get an endcap with only a single hole for that vent? I can only find end caps with 5 holes minimum.

2

Hello,

My first thought is that it might be a little annoying closing this enclosure if there is no way for the air to escape, as closing increases the internal pressure.

3

Hi, it is possible to install the flange inside of the tube first, then bolt the endcap to the flange. This way you can complete the assembly and seal without a vent, but it is more time consuming to open/close the enclosure.