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4" X 3" PIPE FLEX COUPLING CONSTRUCTED OF ELASTOMERIC PCV THAT RESISTS CHEMICALS, SEWER GASES, AND UV RAYS. USE IN SEWER AND DWV PIPING. MAXIMUM WORKING PRESSURE 4.3" PSI. A= ID OF SIDE 1; B= ID OF SIDE 2; C= END TO END OVERALL LENGTH. 4" X 3" PIPE SIZE;-JWH420794 >