Ambient Pressure Diving have found problems with some hoses because connector fittings have not been properly crimped. In the photo to the left (from Divernet), the top hose has been crimped correctly and has eight visible flat parts on the metal collar. The one below has not, and the collar is smooth and round.
Products which may have these hoses include low-pressure hoses used on Inspiration, Evolution and Evolution+ rebreathers; the Buddy Blast Hose (air horn end only); second stage regulator hose (second stage end only); and gas connection system (second stage/ADV end only).
There are more details on Divernet.
