Delivered: 6/21/1956
Status: Heavily damaged at Mickelberry explosion on 2/7/1968 and junked in 1969
| High Pressure 6 (6-1-6) (10/19/1956 - 5/1958) |
| High Pressure 1 (6-1-1) (5/13/1958 - 6/20/1961) |
| Spare high pressure (1961 - 9/18/1964) |
| High Pressure 1 (6-1-1) (10/9/1964 - 11/16/1964) |
| Spare high pressure (1965 - 1969) |
| Squad 10 spare (3/21/1966 - 8/9/1966) |
| Squad 6 spare (8/18/1966 - 3/16/1967) |
| Squad 5 spare (3/21/1967 - 1/16/1968) |
| Squad 3 spare |
Additional spare assignments for this apparatus may appear on the Company History page
Had a 2nd turret gun installed during May 1958; High Pressure 1 originally OOS on 6/20/1961, though one source lists this as assigned there until 9/21/1961; High Pressure 1 OOS, again, 11/16/1964; damaged by radiant heat at 18th & Clark on 11/16/1964, while being used as Squad 8's spare