| 137 / | HD | FLUID HANDLING |
| 154 | DF | DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7} |
| 171 | DF | .~ Fluid separating traps or vents {5} |
| 177 | DF | .~.~ Discriminating outlet for liquid {4} |
| 183 | DF | .~.~.~ With fluid responsive valve {3} |
| 185 | ![]() | .~.~.~.~ Gas collecting float (e.g., inverted bucket) {1} |
| 186 | DF | .~.~.~.~.~> Downstream from valve |