On a standard manifold gauge set, what color is the low-side (compound) gauge and hose?
Refrigeration · EPA 608 Core. The correct answer, and the reasoning behind it.
The refrigeration cycle, refrigerant states and pressures, gauges and leak detection.
The question
On a standard manifold gauge set, what color is the low-side (compound) gauge and hose?
- Red
- Yellow
- BlueCorrect answer
- Green
Why “Blue” is correct
By trade convention the low-side compound gauge and its hose are blue, the high-side gauge and hose are red, and the center utility hose, used for recovery, evacuation or charging, is yellow.
Source: EPA: Test Topics
Why the other answers are wrong
- Red — Red marks the high side.
- Yellow — Yellow is the center utility hose.
- Green — Green is not part of the standard manifold color code.
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