Could I use this QC to connect a Mares Dragon BC to a Mares Avyss 22 Navy Regulator.
Darrick(Certified Scuba Instructor at Scuba.com):
Hello Enrique, you would also need the low pressure hose to connect to the 1st stage and to this adapter.
More About This Product
'SeaQuest Style' QD Adapter
Convert any standard regulator hose to a 'SeaQuest Style' QD hose Installs to the second stage end of a regulator hose Chromed brass construction Low pressure use only - below 200 psi Factory cleaned - Viton o-rings
Compatible with: SeaQuest Air Source, US Divers Air Mic P/N AC925