Mueller Stainless Steel BioReactor Vessel only, rated MWP 50PSI & FV @ 482 degrees F, heat transfer surface rated MWP 90 & FV @ 572 degrees F. National Board # 17575. The unit has 3 - 2 1/2" OD ports, 7-1" OD ports, 5 - Sampling ports, 1- 4" round site-glass, 1- 18" Oblong site glass, 3" CBO. Vessel is 121/4" diameter x 36" straight wall with an 11" cone bottom. All ports and outlets are Tri-Clover sanitary fittings. Never Used, Cover Missing.