The aqualung diaphragm retainer tool for old models is used to remove and install the round threaded diaphragm retainer ring.
 
By locking the tool in the small openings of the ring on top of the diaphragm it can be opened and closed.
Take care to not close the ring with too much force this will cause the ring to break or damage the threads.
 
It fits the diaphragm retainer ring of several (older model) Aqualung 2nd stages.
 
The diaphragm retainer tool for old Aqualung Titan and LX second stage is precision machined from acetal.
 
GTIN: 08720865017303