| 220 / | HD | RECEPTACLES |
| 200 | DF | CLOSURES {45} |
| 202 | DF | .~ With condition responsive vent or valve {1} |
| 203.01 | DF | .~.~ Responsive to pressure {10} |
| 203.19 | DF | .~.~.~ Specified valve structure provides a diverse function (e.g., leakage preventing, lock releasing) {3} |
| 203.2 | | .~.~.~.~ Float or gravity valve |