You cannot breathe directly out of a scuba tank because of the high pressure. A regulator reduces pressure to safe a level that can be inhaled by the diver. A diving regulator has two parts: the First Stage reduces the tank pressure and connects it to the Second Stage which contains the mouthpiece for breathing
With the bulletproof design of the Hollis HP5 first stage the H-O2 Tech Regulator is certified for up to 100% oxygen service thanks to highly specialized component materials and manufacturing processes.
Cleaned and assembled in a clean room environment with specially designed materials
Halocarbon based lubricants and color-coded for easy identification