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What is the green replacement spring for an MK-3121?

Issue:
Replacement springs and Diaphragm for MK-3xxx Series, MK4-3xxx Series

Product Line: 
HVAC / Field Devices

Environment:
Actuator

Cause:
Replacement / Installation / Maintenance

Resolution:
PND-045-343 - (3 to 8 range / green spring).
PND-045-345 - (5 to 10 range / black spring).
PND-045-348 - (8 to 13 range / blue spring).
PND-002-1  -  Diaphragm
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