Unused 50 liter (Approx. 12.5 gallons) Working Volume Precision Stainless Stainless Steel Bioreactor Vessel. Shell rated 50 PSI/FV @ 350 deg F; Jacket rated 75 PSI/FV @ 350 deg F. Interior 12-15Ra, mirror; Exterior ground & polished; 4-baffles; Centered mixer port.