*PLUMBERSSTOCK EXPERT* responded:
Hi! Thank you for trusting PlumbersStock with your concern. The 6" and 4" sizes of this PVC SDR35 sanitary tee are the inside diameters of the pipe. The outside diameter of the pipe that could fit into the 6" end should be 6-3/16". The OD of the pipes that could fit into the 4" ends should be 4-3/16". We hope the information helps! To start placing an order, just click Add To Cart and fill in the required fields. Should you have further questions, please ask away! Thank you for visiting Plumbersstock.com. Have a great day!