Simple and reliable, the R105 is the 2nd Stage of choice for diving schools, rental centres and new divers, as well as avid recreational divers looking for a basic backup breathing system. It offers smooth dependable air delivery and is built to last. The compact casing is based on the S620 Ti with an anti-scratch front cover and a metal classic downstream valve design. Included is a dive/pre-dive VIVA switch plus a soft, co-moulded purge button for easy purging, and left or right hose routing for use on stage or pony bottles