A lot of companies sell replacement tubes for boats. How big of boat was it? May be able to set you up with some replacement tubes. But chances are you can go to any company and replace them (outcast, bucks, creekcompany, skookum, etc). Just depends on the price you want to pay and how big of tubes you need. You can email me if you need any help. Know of a few places that have tubes (and know of someone who has some smaller waterskeeter replacement tubes fairly cheap).
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Cataraft Pro Staff
Team OkieWhore
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Northwest River Fisherman