Crystallized nylon-hose interiors can cause regulator failures.

From ALERT DIVER ONLINE.

Scuba equipment failure or malfunction is a relatively rare factor in diving-related accidents and fatalities. When it does occur, the most common and hazardous malfunctions involve regulators and buoyancy compensator (BC) power inflators.1Thus, a recent report to DAN® of a regulator failure was not necessarily surprising, but the cause in this particular case turned out to be quite unusual.

http://www.alertdiver.com/crystallized_hoses

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