How to Replace a Geberit Flush Valve Seal (UK)
Fit a new bell seal on Geberit UP320/UP720 flush valves. Cures constant trickle into the pan.
Geberit
Symptom
Trickle into pan hours after flushing. Blue-dye test in cistern shows blue in pan.
OEM part numbers
- Full flush valve — 240.638.00.1.
- Bell seal service kit — 240.045.00.1.
Fit
Remove plate. Rotate flush valve 45° anti-clockwise, lift out. Replace bell seal, refit with slight silicone grease on the flange.
Frequently asked questions
- How often does the Geberit bell seal fail?
- 7–12 years typical. Hard water areas reduce to 5–7.
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