Schedule 40 PVC Tee, 1-1/4 x 1-1/4 x 1/2 Inch. A tee is a plumbing fitting that allows you to connect three sections of PVC tubing or Piping. Each of the three connections has slip fit connections, the two outside connections measure 1-1/4 inch nominal size and the bottom connection of the tee measures 1/2 inch nominal size. The fitting is specifically used in order to connect three sections of schedule 40 PVC pipe. These fittings are great for water transportation applications such as irrigation and sprinkler systems. However they should never be used for gas or compressed air applications.