The Scubapro BCD tool is during the Scubapro equipment service to open and close all valves attached to Scubapro BCD.
Because of the big square opening in the middle, it can also be used to open the valve connected to the inflator assembly on top of the jacket.
Scubapro tool #43.039.103
 
The Scubapro BCD tool is precision machined from white acetal and has hardened stainless steel pins.
 
GTIN: 8720828266328