WBT YellowDuct horizontal tees may be used to branch off the main route or provide a method of breaking into horizontal duct. They are available with or without covers. WBT YellowDuct vertical tees can be used to drop cables vertically from horizontal routes into frames or cabinets. Retro fit tees provide open access and are used where cables are already in place. They are available with or without covers.Both vertical and horizontal tees can also be used as a means of drop off.