Straight Connector 3 - 5.5mm & 3 - 5.5mm. Quality straight tubing connectors for use when joining lengths of flexible tubing together. These come with tapered connections, to allow different bores of tubing to be attached, and both ends are the same. Sizes refer to the min/max diameters of each end. Material: polypropylene, autoclavable. Supplied as a pack of 10.