4" X 4" 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 SIZE 1; B= ID OF SIDE 2; C= END TO END OVERALL LENGTH. 4" X 3" PIPE SIZE; 4.-JWH420808 >