b) trench (relief slot): take the air from the trench leading out. There is depth and breadth is greater than the lead track, to reduce pressure and the air escape completely. Usually has a size of 20 x d (d: depth of Groove Guide) 1-the layout Should be placed in many different positions along the canal system and the way how the details. But they especially need is in the position to be filled out in the end. Usually it is those areas far from the entrance most plastics. Because when this last area, then fill the air being compressed and formed the gas trap should it be arranged here
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