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  4. Clack WS1 or WS1.25 - How to Tell the Difference
Customer Wrote:
I am fairly confident that what I have is a WS1, but I cannot find a label with either a model or serial number.
What is the best way to verify that what I have is the WS1?

The easiest way is by the Color of the Spacer Seal Stack assembly.
Gray for WS1
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