TUSA SS-11 Octopus
The TUSA SS-11 safe-second has a venturi adjustment (small lever) on the side to adjust the air flow coming through the regulator. Combine this with the compact case design and the use of TUSA's Advanced Flow System (A.F.S.) and you can see why this is a top of the line alternate airsource.
The hose routing can be changed to the left as well (left and right hose layout compatability) and the purge button in the front is above average in size.