Im not sure on the CAK tanks, i fed my vent up onto the roof with a marine bulkhead vent fitting.I’m looking at the underslung CAK skirt tank for fresh water on my build. How do you protect the vents on these, so contamination doesn’t come in the top? As far as I can tell the vents are just two little holes, but I would be very happy to hear differently.
Someone with a CAK tank might be able to let you know what they have done.