4, PVC Backwater Valve, Prevents Sewage Or Any Other Fluid From Flowing Back Into A Water System, Elastometric Seal In Quick Action Flapper Ensures A Water Tight Seal, Threaded Access Cap Incorporates A Neoprene Seal For Positive Sealing Can Be Tightened Or Removed By Hand, Valve Hub Fits DWV Pipe Can Be Adapted For Sewer Drain Pipe
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