Used Sparkler pressure leaf filter, 50 square feet surface area. Unit is model 33-D-9, complete with scavenger plate but missing the 9 horizontal deep plates, 33" diameter filter chamber is 304 stainless contact parts, vertical tank designed for horizontal leaf/plate bundle, complete with clamp-on swing away top lid. Filter is rated at 60 PSI @ 350 deg. F., Serial number 20892, manufactured new 1977, Nationa Board number 1511. Unit could be used as vertical retort or autoclave with direct steam inlet.