COUPLE SDR35 6X4"HXH by PLASTIC TRENDS MfrPartNo P661 Application: For SDR35/ASTM3034 PVC Sewer and Drain Pipe Fits For: For SRD35/ASTM3034 PVC Sewer and Drain pipe Compatible Pipe Material: PVC End 1 Diameter: 6 in. End 2 Diameter: 4 in.