Spin Weld Outlets can only be attached to our semi-transparent tanks as ½ inch to 2 inch female thread connections. Please mark the position and size of the connections in the technical drawing of the desired tank and send it to us by e-mail. The technical drawing with the exact tank dimensions can be found on the product page as a PDF file. Further information about sizes and a step by step description on how to order HDPE Fusion Socket on our tanks you can find here: Spin Weld Outlets and on the article description of a Spin Weld Outlet itself.