Re: draining logs
The air fitting are multi purpose. They can release pressure, as pressure can build up in hot weather. They also provide a method of pressurizing the tubes for testing after manufacturing. Most tubes are tested at approximately 6 lbs. More can cause catastrophic damage. As to the baffles, they are not always completely sealed between the compartments. In the event of a major puncture they will prevent water from immediately filling the entire tube, allowing you to get to shore. Water will slowly enter the other compartments. On my previous pontoon which had a leak, with a raised bow, I would pump out the water at the rear, wait for more to drain to the rear and pump again, and repeat the procedure 3 or 4 times to get it all out.