AP Valves Self-sealing SMB with Inflation Cylinder is an innovative gem of an essential diver safety gear.
This self-sealing SMB comes with an independent inflation mini-cylinder (0.1 litre 232 bar available with either DIN or INT fittings). This not only makes deployment a very simple procedure but it allows you to conserve expensive mixed gases for what they are intended rather than SMB inflation.
The mini-cylinder is easily replenished by decanting from a standard air cylinder. It folds neatly away inside the rolled-up SMB and the SMBCi can then be stowed in a pocket, attached to an external D ring or wrapped in the dedicated SMB velcro pouch at the rear left of the AP Commando and Commando Explorer.
The key advantage over similar systems is that the SMB can still be inflated via the baffle with a second stage in the event that you have forgotten to fill the mini-cylinder.