
Operation manual GMK-A
Page 23 of 35
B0887
3. Screw in and tighten the screw plug with sealing ring.
6.5.1.5 Restoring an outlet that has already been closed
1. Unscrew the screw plug, remove the sealing ring.
2. Check the completeness of the non-return valve cartridge before screwing it in.
Important: There must be an O-ring on the outside of the cartridge.