This elbow provides a method of diverting the 220mm duct system around objects. It can be used with a tee to feed a duct at a 45-degree angle to the main system. The elbow can also be used in pairs to align ducts and other components with an offset. There are two 220-mm outlets. One is equipped with a glued-in, modified joiner. (The special joiner provides a smooth internal curve for optical fibre cords.) The other side uses either a: standard joiner (Part No. TC1279-25) or a slotless joiner (Part No: TC1279-250A); that are available separately.