The diving hose that connects the regulator to the tank's pressure gauge can separate reducing the available air supply to the diver, posing a drowning hazard.
The front assembly of the kickboards/scooters can break and the handle can detach or partially detach, causing loss of control or loss of balance. This poses a fall hazard to the rider.
The top portion of the tailwind rack that connects trailercycles to a towing bicycle can break and allow the trailercycle to disconnect, posing a fall hazard.