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If you are unsure that your water bottle will withstand whatever pressure you intend to put into it, fill it with water as high as possible PRIOR to pressurizing it with air. Air under pressure has a lot of energy and can turn nasty when released. If the bottle decides that it has had enough and breaks, it's called shrapnel and severe damage you or nearby objects. Water doesn't compress, what little air in the tank or lines will compress, pressurizing the tank, testing it. If it breaks, the small volume of air will release very quickly and resulting in just water spilling. This is how very high pressure tanks are tested in the aerospace business I'm in. Safety first. Even then we do it in safety cages, but then we do test things at 45000 psi, blow them up at 75K. If you are worried, lay a towel over the tank. Jeff '67 Sqbk Get your FREE Email at http://mailcity.lycos.com Get your PERSONALIZED START PAGE at http://personal.lycos.com ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe