What symbol on a pneumatic schematic shows that branch lines split off the main line?

• A. A dash
• B. A dot
• C. A circle
• D. A tee

Answer: (B)

In pneumatic schematics, a small dot at the point where lines meet marks a connection where a branch splits off the main line. That dot shows a junction—air can flow from the main line into the branch. A dash just represents the line itself without indicating a junction. A circle isn’t used for this purpose in standard schematic notation. A tee can represent a branching in piping diagrams, but in many schematic conventions the dot is the clear marker of a branch connection on the line.