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Attach the check valve onto the loose end of the airline tubing so that the end of the check valve with the flapper (looks like a colored or horizontal bar) is facing away from the aquarium and towards the air pump
Side pockets are ideal for water bottles, but check the bottles be easily secured in these pockets or they will they fall out (see our favourite hiking water bottles if you need a new one!)
Equally (if not more) important is your line choice
ASSEMBLING them back together is a breeze!
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