Looks like 4 inch pvc as the flotation devices. Just use band clamps to strap it all together.
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I'm thinking, if it happened to capsize, tangled in a hammock is not where you'd want to be...
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I actually used to live right near that very pond/stream. It's disgusting, like 99% duck feces. Definitely not the kind of place you'd want to be swimming, much less tangled in a hammock.
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