Large Bore Touhy Borst Adapters accommodate a wide range of catheter sizes up to 18 French. Both have a crystal clear polycarbonate body that makes it easy to observe flow. Turn the large, easy-to-control cap to adjust the size of the orifice in the silicone gasket. These adapters are capable of providing complete closure, minimizing the possibility of leakage. The caps may also be able to be produced in custom colors for specific applications.