SUPERB GRUNDFOS STR2 1.5 CN BAR TWIN. MODEL:STR2 1.5 CN. Grundfos STR2 1.5 Twin Negative Shower Pump & Hoses. The grundfos STR2 1.5 Twin Negative Shower Pump is a negative head shower booster pump used to increase water pressure to a gravity fed hot water system.
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