PVC tubing is pretty good for chafe protection. We used it on our trailer boats for years when using basically an all line rode that was retrieved by hand. Often about 6m long. Use a clamp on it at the end nearest the anchor if using a long piece like that. We had about 2m of chain as well since for diving we always anchored amongst rocks, and a little bit of chain helped keep the line clear of the bottom. The PVC got scratched up a fair bit, but never cut.
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Brian
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