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БлрOuter cover
Rubber cover - allows to protect the braiding from mechanical damages.
Spring - protects the flexible part of the hose from kinks. As a rule, it protects the end fittings from bending; sometimes it is installed along the length of the metal hose.
Metal hose - if necessary, PTFE tube (smooth or corrugated) is enclosed into a metal hose; this allows to protect PTFE part of the hose from external mechanical influences and extend the service life of the product.