Mfg. in 1969 by American Bridge. Serial number: U6391. Length: 43'. Diameter: 96". Currently setup for NH3 use. Needs valves changed for propane use. On the bottom there are (2) 2 1/2" and (2) 3 1/2" threaded holes. On the top there are (4) openings, some with pressure relief valves. Cannot be used for propane in ND. Taken out of service 1 year ago.