To provide a composite excellent in mechanical strength or in electric conductivity and obtained by combining a carbon nanotube structure and ceramics, and a method of manufacturing the same. The barrels are coupled together with a number of coupling members, and the coupling member each include a hinge line for allowing the barrels to be easily disengaged from each other, when required. After insertion of a medical instrument into the valve through at least a portion of the flexible tubular seal element, a proximal portion of the valve housing may be rotated to cause the tension of the flexible tubular seal element to increase over the inserted medical instrument and engage the valve in a closed position. The C-shaped channel member includes a top portion presenting a plurality of attachment positions for retaining a fastener therein.