It may be in the safety of having numerous chambers. My toon is a 1984 JC 24 ft. We have up for sale a new G3 Suncatcher X24RS pontoon with a Yamaha 150 4 stroke outboard. I pulled the plugs on each log & checked for water & ran a long plastic rod inside to find out if there was any foam or not & found none at all. This boat is full of features not found on a lot of other pontoons on the market. Starting with the U shaped logs which are foam filled for displacement which will make sure you With circular pontoons there is no flat surface to bolt the crossmembers so we must use a bracket that raises and connects the deck to the hull. Keep pontoon fencing off the flooring of your pontoon boat. The pontoons can be connected to each other in various configurations to create a diversity of platform layouts: square, rectangular, H or U-shaped and so forth. They are easier to build, and I think the aluminum is lighter (cheaper) than the .080 aluminum in most round tubes. G3 is the only pontoon brand that doesn’t require brackets or risers. Call for sizes - inventory changes weekly. Pontoon logs U shaped new with slight scratch or ding 21 ft plain pair new oem 1900 pair 23 ft with lift strakes u shaped new 2100 25 ft log u shape 2300 22 ft 6 inch round good clean used Bennington 2000 pair 23 ft 6 inch round good clean used Bennington 2000 pair Rub rail call for pricing Ladders Fiberglass console,several styles 400up I called JC Mfg a while back & was assured mine did not have any foam in them anywhere. The pontoons are designed to be transported by truck and are lifted into the water by telecrane, using the upper couplers as lifting lugs. That said, I would be very hesitant to put a U shaped tube between two round tubes. Ellipticals look like an oval turned on their side. There are 26 risers per pack. This is because they have U-Shaped logs that can fasten directly to the crossmembers. I don't know why U shaped logs have been abandoned. U shaped toons look like a U from the rear, and they're filled with foam insulation. Boats, Yacths and Parts for sale, NEW FACTORY BLEMISHED 23 and 25 Diameter Round Pontoon Tubes; [Legend - RS = R. Americanlisted has classifieds in Doss, Missouri for new and used boats. They are U-Shaped so that you can put one u Re: Foam filled U-shaped toons I have U shaped logs as well. My Starcraft has U shaped toons, and they've performed very well for the last 27 years. 20' tubes are $600; 22' tubes are $700; for longer tubes, call for a quote. The space created by inserting the spacers allows water and other debris to wash over the side instead of piling up against the railing. It helps to prevent build-up of dirt and mildew. They're less expensive to make, but seldom seen on todays pontoon boats. New or factory blemished and used pontoon logs for adding a third tube to your existing pontoon, replace a damaged tube on your pontoon, or for building your own pontoon. No water was found either.