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Hayward Sight Glass(2") Slip x Slip - In-Line, SP1074S Cross Reference: For FIP (threaded) valve use SP1074, For 1-1/2" valve use SP1072 or SP1072S A must have item when backwashing to see when the filter is clean. Do not guess or have to go to where the water comes out.
You can see the dirty water right at your filter.
Hayward SP1074S.
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