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Each water sampler is made of a tube blocked up at each end by a sphere
acting as a ballvalve.The 2 spheres include a nipple.
Before sampling, the tube is 100% clear, the 2 speres being out of the
way of the water flow (A).
External closing system, no internal hindrance.When water sampling is
over, the 2 spheres are released and seal the tube (B).
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