| http://www.w3.org/ns/prov#value | - However, part or all of the foam member can be covered by a different material.Preferably, the exterior surface of the shaped foam is rotationally symmetrical about an axis which is also the axis of the outlet tube, and has a length which is 1.5 to 5 times, particularly 2.0 to 4 times, its maximum diameter.
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