shutter cylinder: 55-1036 (cyl, 3/4 in.x5.0 in.,double-acting)
item 40 of 50-2143A DWG, sheet 3 of 4.
When ordering cylinders, you must also order two orifices (55-0715) and two fitting adapters (55-0634). Apply only one drop of Loctite 425 (89-0048) to the fittings thread.