Lego TwoWay Cylinder Pneumatic Repair (47225 / 63855 and older)
thingiverse
If the little upper connection tube breaks you can glue this one over it and works perfectly (for my 1989 Lego Excavator) Put it over and glue on the joints (be careful not to glue the inside of the tube!!) Tinkercad url: https://www.tinkercad.com/things/8czWA1xNl8F
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