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tubo in alluminio pieghevole bianco, laccato internamente con vernice epossifenolica e con sigillante nella piega.
white collapsible aluminium tube, interior lacquered with epoxy phenolic coating, and with a sealing compound in the fold.
per compensare dilattazioni diversi di materiali differenti (es. raccordo in metallo e tubo in materiale plastico).
the product provides the seal with a certain elasticity, to compensate the different thermal expansion of different materials (e.g. metal fitting and tube in plastic).