The membrane lining the jaws is soft and corrugated.
The mouth of the pitcher has a corrugated rim (peristome) formed by incurving of the margin, the convex surface of which is firm and shining.
You could cut a small square of corrugated cardboard or foam to do the same job.
Continue ahead up a rising field, to a gate at the right of a corrugated barn.
The corrugated tubing is snapped into the clamp where it is securely held.