don't forget 99% of tanks in the uk are steel. i can dive with twin 300bar 12's , plenty of insulation and no weight at all in fresh water and only 6-8 lbs in the sea. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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