AN Fittings. Alum: 6D Tube O.D.: 3/8-1/4. Alum: 3D Pipe Size: 3/8. Alum: 2D Pipe Size: 3/8-1/4. Alum: 2D Thread Size: 1/4. Alum: 4D Tube O.D.: 1/4 Thread Size: 7/16-20. Alum: 3D Tube O.D.: 3/16 Thread Size: 3/8-24.
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