Conduit Adapter; Type Female Threaded; Connection Type PVC Conduit to Threaded Fitting; Trade Size 4"; Material PVC; Standard Package 20 per Carton; Applicable Standard NEMA TC-3; Approval UL 651, UL 514, CSA; Overall Dimension 4.025" Inner Diameter x 3.34" Length; Thread Size 4"-8 TPI; Width Across Flat 5.1"; Application Residential, Industrial, Commercial Buildings