IMPORTANT SIZE INFO: flexible coupling's inner diameter is 1.3 inches and connects with the pipe's outer diameter of 1.3 inches so the pipe nominal size is the 1-inch industry standard
COMPATIBLE WITH MULTIPLE PIPING SYSTEM: flexible coupling connects DWV (drain-waste-vent) piping, cast iron, plastic, copper, or schedule 40 steel pipe
FOLLOW THE MARKINGS: each rubber fitting is marked with part number, size, and certification
INDOOR AND OUTDOOR USE: can be used for non-pressure DWV (drain-waste-vent) piping systems and sewer systems whether indoors or outdoors
CERTIFIED AND UPC APPROVED: conforms to ASTM C1173, CSA B602 and rated for underground use