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Disconnect the air lines supplying that air bag and couple them together with a compression fitting or push-in fitting. Air the trailer back up. Undo the bolts at the top and bottom of the air bag. Remove the air connections from the old air bag and install them on the new one (use some thread seal on the threads). Installation is the opposite of removal.

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Q: How do you change airbag on a axle on a semi trailer?
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