Hydromatic Model S4SD, SB4SD Series Submersible sewage dual seal pumps, 4" Discharge - The Hydromatic S4SD and SB4SD sewage pumps are designed to transfer raw sewage with solids as large as 3". 4"Discharge Submersible Sewage Ejector Pump Models available: S4SD - 1150 RPM, SB4SD - 1750 RPM
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