Used 100 Gallon (80 Gallon - 300 Liter working capacity) Sanitary Pressure Vessel rated 50 psi/full vacuum @ 302 Deg.F. internal / external rated 15psi @ 302 Deg.F. Serial # E-488-95, National Board # 4434, Built 1996. Mounted in Frame. Second unit Serial # E-487-95, National Board # 4433, Built 1996. (2 units available)