A multipurpose connector member for connecting PET bottles, which has an upper part forming a liquid outlet mouth to be sealed with stopper; the cylindrical side wall; and a lower part having a concave area or a recessive on the beneath surface is provided, in which another liquid outlet mouth to be sealed with stopper is provided downwards at the center portion of the said concave area or the recessive beneath the bottle, or a symmetrical shape of liquid outlet mouth portion corresponding to the said liquid outlet mouth 11 is extended in the integrated manner from the cylindrical side wall, whereby approaching the desired shape of construction by connecting the said PET bottles and separately the various shapes of connector members and/or subsidiary connector members into an appropriate feature for the purpose.
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