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What is the difference between an AV-7400 and an AV-400 linkage kits?

What Valvels can the AV-7400 and AV-400 linkage kits be used with ?

Product Line: 
HVAC / Field Devices

Valves and Actuator

Replacement / Installation / Maintenance

AV-7400 is a linkage kit for 1/2" to 2" (VB-7000 Series) valves on a MK-2690 pneumatic actuator.
AV-400 is a linkage kit for 1/2" to 1 1/4" (VB-9000 Series) valves on a pneumatic actuator. However they are adding the stem extension for the VB-7000 Series in the AV-400 kits.
They can use the AV-400 kit as long as the label says it is able to be used on the VB-7000 Series Valves
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