| http://www.w3.org/ns/prov#value | - The boss peripheral wall 46 and skirt 47 are preferably inward tapered and frustoconical in shape, for example to maintain the parts of the push-in portion 40 coaxial, and thereby guard against any tendency of the push-in portion 40 to bend laterally in use, and to facilitate molding of the push-in portion 40 integrally in the bottom wall 12 of the bottle.
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