1. Large close knob makes twisting and valve closing very easy; 2. Large bore of torque device suits for all sizes of angiographic catheters; 3. Screw Y connector makes it easier for the doctor to operate and is more popular in the market; 4. Single Y Connector/ Adaptor is also available. More Product Features Trademark: Sunmed Standard: 8F Screw Y connector, Large hub insertion to Origin: China Company: Sunny Medical Device (Shenzhen) Co.,Ltd.