Engine: Expired / Refrigeration AC

1. A Closing the valve labeled "G" isolates the hose labeled "H" from the gauge labeled "A".
2. B The valves labeled "G" and "C" must both be open to read system pressures on the respective gages labeled "A" and "B".
3. C Closing the valve labeled "G" isolates the hose labeled "H" from the hose labeled "J".
4. D Opening fully and back seating the valve labeled "G" isolates the gauge labeled "A" from the hose labeled "H".

Tip: press A-D to answer