1-1/2" 4-way Tee PVC Fitting Connector DO NOT use these fittings for plumbing projects. The 4 way LT PVC pipe fitting, also known as a side outlet tee or 4 way corner fitting is commonly used to build the sides of a box or cube out of PVC pipe. It is also useful to make the ridge on PVC greenhouses or small PVC buildings. Some dog agility customers use the 4 way LT at the base of jump pole stands. All four outlets are non-threaded sockets 1-1/2" Fittings fit on 1-1/2" Schedule 40 PVC or Furniture Grade PVC. Please check out ourPVC Sizing Guide (Specification Sheet)to make sure that you order the correct size PVC Fittings. PVC is NOT measured by the outside diameter, and doing so will result in receiving fittings that are too big for your pipe. Furniture Grade means this fitting has a non-marked, glossy finish.