One used De Dietrich Glass Lined Pressure Nutsche Filter, Approximate 0.28 Square Meter, 3009 Blue Glass. Approximate 23-5/8" x 17" deep top section, bottom section approximate 6" straight side, dished bottom. Internal rated 100 psi and Full Vacuum at -20 to 500 degrees F. Carbon steel jacket rated 90 psi at -20 to 500 degrees F. Sections 1 and 2 clamp together, removable top head with davit arm. Serial#36174, National Board#6968, built 1998.