Pre-engineered, fixed tubesheet models available for quick delivery. Brass, 316 S/S and Carbon Steel shell options. Copper, 90/10 CuNi and 316 S/S tube options. Select from 1, 2 or 4 passes, covering areas as large as 250 square feet. U-tube, removable bundle models also available in 2, 4, and 6 passes, covering areas as large as 1900 square feet.