In a 2x2x1 tee, what does the "1" refer to?

In the context of a 2x2x1 tee fitting, the "1" specifically refers to the diameter of the branch outlet. This configuration indicates that the tee fitting has two equal-sized outlet openings measuring 2 inches, which are designed to connect to the main line or pipe. The "1" indicates that the branch outlet is 1 inch in diameter. This designation helps plumbers and fitters understand how the tee can be used in a plumbing or piping system, specifically regarding flow rates and compatibility with other pipe sizes.

The 2x2 components are designed for the main outlet, which is typically larger, while the "1" signifies a smaller branch outlet, allowing for the connection of a pipe or fixture that requires a reduced size. Understanding these dimensions allows for proper installation and ensures that the components fit together correctly within the overall piping system.