This cross connector is used to establish a right-angled intersection between two 300-mm ducts. I.e. all 4 arms of the connector are connected to 300mm duct or other components, using the standard joiner (Part No: TC1279-320). 2 x Standard Joiners (Part No: TC1279-320) are supplied. A slotless joiner for 300mm duct (Part No: TC1279-287A) is also available NOTE: Care should be taken not to lay more than 50mm depth of pigtails or patch cords in troughing, particularly where they cross each other at right angles. This may occur with this connector.