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Hayward Sight Glass(1-1/2") Slip x Slip - In-Line, SP1072S Cross Reference: For FIP (threaded) valve use SP1072, For 2" valve use SP1074 or SP1074S 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.
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