CareFusion Control Suction Catheter, 18Fr, 20" L Tri-Flo® Suction Catheters are designed with two triangular eyes and a beveled tip to be less traumatic to your patients while still providing high suctioning efficiency. Clear connectors and depth markings are standard on all 5/6 and 8 Fr sizes. Catheters are available with or without a control port to provide you with the choice of continuous or controlled suctioning.