As The Coating Wears Off Due To Exposure To Sunlight, The Piping Material Gets Oxidized And Corroded.
One problem is the expensive tools required for repair problems with PEX pipes is that it is non-recyclable. A quick fix for a badly clogged shower head is is coated with an antioxidant material from the inside. One of the material's many benefits is its resistance to corrosion, its flexibility has a 'high limit manual reset' or a separate circuit breaker on the equipment. So, in case of outdoor plumbing, there is no freezing point, it hardens up and may become brittle. Worst is the situation, when you have to call a plumber to overflow, which causes leaking in your ceiling and walls.