What is the differance between a Vent -PS1YGY-08001 and a Vent -PS1YGY-08001 ?
As given neither item enters into the site.
Can you verify which two you were looking at?
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If it is VENT-PS1YGY-O8001 vs VENT-PS1YGY-O8002
The difference would be Air Permeability
001 is > 550ml/min at 7 kPa
002 is > 1000ml/min at 7 kPa
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