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What does "pliable, self recovering" stand for?

Pliable, self recovering pipes are classified 3 in the fifth digit, i. e. the pipes have a maximum deformation of 50% (based on the outside diameter). This permissible deformation reduces the inside diameter by 72%, which means that the inside diameter of a size 25 pipe shrinks from 17.9 mm to 5.0 mm.