The coupler member is particularly useful for connecting a solution container with a catheter permanently connected with a patient for continuous ambulatory peritoneal dialysis. The coupler member (30) has a tubular body with screw threads (32) for mating closure with another coupler (26). The coupler member has a tubular portion (70) axially spaced from the screw threads for sealingly engaging with a corresponding portion of the other coupler in a luer-type seal. The coupler member, as well as the other coupler, are made of a material and a thickness to permit the substantial transmission of ultraviolet radiation from the exterior to the interior thereof.
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