Used Precision Stainless 316L stainless steel 100 gallon pressure tank. Unit measures 36" dia x 20" straight side with dish top and cone bottom. Unit rated for 50 PSI @ 300 Deg F internal. Manufactured new 1987, unit is portable on casters and has 1-1/2" center bottom discharge. Serial number 7894-1, National Board Number 1853.