Dräger model BG 174
The successor to model BG 172
The BG-174 oxygen protection device is a back-portable device with a semi-open design. It replaced the devices of the Dräger model BG-170/400 and model BG 172 series. Approval 1966
Design 1963
Therebreathersite was founded by Jan Willem Bech in 1999. After a diving career of many years, he decided to start technical diving in 1999. He immediately noticed that at that time there was almost no website that contained the history of closed breathing systems. The start for the website led to a huge collection that offered about 1,300 pages of information until 2019. In 2019, a fresh start was made with the website now freely available online for everyone. Therebreathersite is a source of information for divers, researchers, technicians and students. I hope you enjoy browsing the content!