The self-sealing BUDDY SMBCi (Surface Marker Buoy - Closed with Inflation Cylinder) features a lightweight aluminium 0.1l mini-cylinder which is mounted at the foot of the buoy just above the internal baffle.

Simply attach a line or reel and you have a superb decompression marker buoy and also a buoy that can be used as a standard surface marker.

One key advantage of the BUDDY SMBCi over similar systems is that it can still be inflated via the baffle in the usual manner ? with a DV or an air-gun - in the event that the diver has forgotten to fill the mini-cylinder.