Another common type of tee is Reducing Tee. It is similar to the straight tee, except that one of the threaded openings is of a different size than the others. Reducing tee has two ends the same and one end smaller. Thus, a tee with one branch smaller than the run openings is referred to as a reducing tee. In other words, the runport is larger than the branch port.

Many configurations of "reducer tee" are available in the market, meaning that one or more of the sockets is smaller than the others, depending on the nature of application. Reducing tees, regardless of their material composition, are always described in the same fashion. To describe a reducing tee, one must locate the largest size on the run of the tee. The next size indicated in the description of the reducing tee is the side opposite to that with the largest size on the run of the body. The final size in any description of a reducing tee is the branch side.

Malleable Iron, Cast Iron, Brass, Copper Pressure, Carbon & Stainless Butt Weld & PVC are some of the common types of materials used for manufacturing reduced tees. These fitting are used to reduce delivery lines, to feed ice makers and other applications requiring a reducing tee fitting. Reducing Tee fitting are able to convey potable water, wine, drinks and alimentary fluids. They are non-corrosive and resistant to most of the chemicals, increasing the range of applications of the pipes. Reducing tee is used where a branch line needs to be smaller than the main