Used 304L stainless steel pressure vessel, manufactured by Peerles. Rated 606 psi @275F. 4'dia x 8' tall. 0.875" wall thickness. 304L cladding; openings: top-2"vent; side: (2) 18"near top, 20" manway w/cover near btm. Mounted on 3'6" skirt; oah-14'10".