Push wall lead-in back into the plastic clamp.
The position of the key surface (SW 25) must be up or down.
The clicking into the groove signals the correct position.
Re-tighten the union nut.
Loosen (SW 19) flexible hose onto the filling valve.
Open corner valve.
Flush pipeline.
Close corner valve.
Re-mount (SW 19) the flexible hose onto the filling valve.
Handling
Viega Steptec WC module with empty pipe for shower WC (AquaClean)
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