Response to Hi Brian, Yes this is the proper replacement valve for the Hayward pro series high rate sand filter model s166t. The valve listed on this page is the original valve made by Hayward. We also carry the valve made by PureLine which is also a direct drop-in replacement for your valve. The PureLine valve is $59 and can be viewed or purchased through this link PureLine Replacement Valve for Hayward SP0714T

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