Response to Hi Gretchen, this particular valve is not the Pentair 263042 Check Valve however we do carry the Pentair 263042 Check Valve. We also carry a Generic Version of the Pentair 263042 which will save you some money. For the Hayward tank adapter part # of de2400pac2cs can you double check this number as this is not showing as a good prat # with Hayward, please email us back with what you come up with.

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