This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Diving cylinder BV. en schematic of the backside of diving cylinder showing the diving regulator The schematic was based on an image in the book Complete diving manual by Jack Jackson own KVDP Scuba regulators
Page 2023 Free-images.com. All images are Public Domain