The green strip is the sensor on the side of the anks that allows me to tell almost to the gallon how much water is in each tank. It is on the outside only, so it can never get clogged up.
I vented mine with a faucet aerator tip with just the double screens in it (took the plastic pieces out of the insides of it). Attached that to an existing fitting on the upper edge of the tank. Vents freely in both directions and keeps the bugs out.
Didn't someone just hang them from the roof of the bay? happy coaching!buswarrior