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Can you give us more information? Is this for an infloor cleaning system? What brand? Filling out your signature really helps.
I suggest you read ABC's of Pool Water Chemistry and consider reviewing the entire Pool School eBook.
A google search for replacements shows that infloorpoolparts.com offers A&A manufacturing 522044 or a Paramount Pool Valet Retro kit that may serve your purposes. There are likely other options elsewhere.
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