Stops back flow of water and sewer gas | Full flow design | This valve is designed for low pressure pump applications and can be mounted either vertically or horizontally | Provides minimal flow | No pipe threading is required | The neoprene flapper is weighted with non corrosive backing plates and stainless steel rivet and bends | The flexible couplings isolate motor noise from the piping and the internal flapper design reduces water hammer when the pump shuts off
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