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Rat Bile Circuit Catheter or Portal Vein Catheter: TecoFlex PU; OD tapered from 0.055" to 0.035", ID tapered from 0.025" to 0.015", beads at 0.5", 7.62cm and 15.24cm from the tip, length 68.58cm. Our Rat Bile Duct Catheters/Rat Portal Vein Catheters feature a tapered design to allow easy insertion at the vessel with strong, sturdy tubing at the externalization point. These catheters are an ideal design for either bile duct and duodenal placement or for the portal vein. All catheters are made from biocompatible polyurethane for low vessel trauma and increased patency. Product is for laboratory animal research only. ** If a COA is required it must be requested when the order is placed or a $50.00 fee will be apply. Contact Thermo Fisher Customer Service at 800-766-7000 to request to COA. **