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Description: The bottle continues to hold all its water above the water level in the 'trough', but soon as the water in the trough is taken by plants the falling level will expose the upper hole to the air. It will immediately draw in air while releasing water from the other lower hole in the other side of the cap - and pushing the level back up. It's a demand-valve for water. Stats: Views: 1520 Filesize: 79.24kB Height: 768 Width: 1024 Posted by: Vinlander March 20, 2016, 15:51:47 Rating: Has not been rated yet. Total Likes: 0 Image Linking Codes BB Code

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