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.