Yoshitake GD-27BP Product Manual page 14

Nominal size 65A to 100A: Screw bolt [15] into valve seat [3], and pull them up together.
5. Secure the part A of the spindle [6] (two faces), loosen the U-nut [14] with a tool, and remove disc
[12], and O-ring [11].
13
EPDT-278