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Flush sleeve adapts a Schedule 40 IPS fitting hub to Schedule 30 pipe size. ADAPTER BUSHING - HUB X SPIGOT. SCHEDULE 40 TO SCHEDULE 30.The 3 in. x 3 in. Hub x Hub PVC Sewer and Drain to DWV adapter is used to connect 3 in. sewer and drain (S&D) pipe to 3 in. drain, waste and vent (DWV) pipe in the installation of drainage and sewer piping systems. PVC construction is durable, lightweight, economical and resistant to corrosion and chemicals. Connects sewer and drain pipe to DWV Schedule 40 pipe.