Used Walker 500 Gallon stainless steel pressure tank, constructed of 304 stainless steel. Measures 50" diameter X 50" straight side. Internally rated for 15 PSI @ 250 degrees F / -20 degrees F, ASME code constructed. Includes dished top with 16" diameter bolted top manway, (4) 2" & (2) 1" top openings and bottom with 2" center bottom outlet. Model "Hold", Serial number NL9140, Drawing number SP-27452-D, new in 1996. Last used in pharmaceutical type environment. Very good condition.