The C-SO series are original single barbed straight and reducing connectors. These connectors have no parting line on the barb and have a square center hub. Also, tubing can be started on the barb of this connector before any expansion begins. It will expand the tubing by 43% when it is completely inserted. Available materials are black and white nylon, natural Polypropylene, clear polycarbonate, and natural PVDF. Available barb sizes are 1/16 inch, 3/32 inch, and 1/8 inch.