Pfaudler Single Shell Tank-325 Gallon. Heating/cooling coils, center bridge, and lift top covers. Pressure wall surface with 2 in. clamp outlet. Tank dia: 50-1/2 in. Has side coil only, no bottom coil. Inlet/outlet: 1 in. npt connections. Tri-clamp inlet: 2-1/2 in. (on top). Tri-clamp outlet: 2 in. (on bottom).