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This tee is part of a set of pipe fittings that are designed to connect to Evergreen #224 tubing. This tubing has an Outside Diameter (O.D.) of 0.125″/3,2mm and an Inside Diameter (I.D.) of 0.069″/1,8mm.
By gluing a length of tubing to the flange you end up with two flanged pipes bolted together