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What is the difference between the conventional SY series and the new SY series?

The valve part numbers for the conventional SY series are SY∗∗20, SY∗∗40. The new SY delivers more air flow than conventional design. New SY is plug-in type.

The valve part numbers can be SY∗∗00, SY∗∗01 or SY∗∗31. The old valve types are still available for sale.