3DX-04-28.0-13-68.0-28 Direct Expansion (Dual Circuit Interwined with self-drain circuiting) Handing: Right Weight: 191 lbs Tubes: 3/8 1.00 x 0.866 x Copper - 0.014 Plain Fins: Aluminum 0.010 Corrugated Casing: Stainless Steel 16 ga. Connections: Sweat Copper / .875" Supply / 1.375" Return O.D. Headers: Copper (L) / .875" Supply / 1.375" Return O.D.