A coil spring inside a flexible hose would keep it from gradually folding instead of bending where it became serpentine which could/would block or restrict flow.
If you are seeing it in straight copper the spring has traveled from where it it needed, generally having spring in straight hose and then fitting it into where it gets permanently installed to provides enough friction at the bends that it never travels, sounds like prior maintenance remembered the spring as an afterthought....
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The days are short and the night is long and the stars go tumbling by.. . ~Airstream~
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