Valterra T1005 RV 3″ Slip Socket FlangeThe Valterra T1007 RV 3″ Sewer Waste Valve with Female Thread is a durable flanged valve fitting designed to connect a 3-inch sewer pipe to an RV black-water waste valve. The 3-inch female pipe thread (FPT) end screws directly onto the RVs sewer pipe, while the flange bolts onto the waste valve to create a secure and leak-resistant connection.