Cook® Extra Large Check-Flo – Introducers Product Information Used to introduce large devices for vascular intervention. Related products Add to cart Cook® Beacon Tip Van Schie Seeking Catheters and Van Schie Over-The-Top Catheters $0.00 Add to cart Cook® Lunderquist DC Wire Guides $0.00 Add to cart Cook® Lunderquist Wire Guides $0.00 Add to cart Zenith Flex® $0.00 Add to cart Zenith Thoracic $0.00