Pipe fitting is a job that involves connecting pipes and other components to create a functioning plumbing system. The term pipe fitting can refer to three different types of components: elbows, ells, tees, and sleeves. Elbows are curved pieces of pipe that allow for a change in direction of the flow of water. Ells are similar to elbows but are used to make a 90-degree turn in the pipe. Tees are components that allow for a connection between three pipes. Sleeves are cylindrical pieces of pipe that are used to connect two pipes together.