The Apollo Hookah Harness with Hookah Filtration System.
The hookah diver typically does not wear a BCD, instead they wear a hookah harness. The primary purpose of the harness is to provide an anchoring point for the down line. If something were to grab the down line it would yank the harness and not the regulator. Thus the regulator can not be pulled from the mouth.
The Apollo Hookah Harness includes a filtration system to ensure the air you breathe is clean and safe.