Diameter The Double Wall E-Z Flange Jr. is a 5/8" flange turned out 90° on the outer shell. A 1-3/8" angle flange is inserted into the inner shell. The two flanges are then tack welded together creating a double wall E-Z Flange Jr. This double wall E-Z Flange Jr. can be shipped in sets or factory installed. A set consists of two double wall E-Z Flange Jr. and one barrel clamp. For field installation the installer attaches the double wall E-Z Flange Jr., applies a gasket on one flange, mates the two double wall E-Z Flange Jr. together and attaches the barrel clamp. For field cuts a 5/8" double wall flange sleeve is available, cut the spiral pipe to the measured length and apply the sleeve.