How to Replace a Close-Coupled Cistern Doughnut Seal (UK)
Fix a leak between cistern and pan. Fit a new sponge doughnut seal on UK close-coupled toilets.
Ideal StandardArmitage ShanksRoca
Symptom
Water on the floor behind the toilet after each flush. Confirmed by drying the joint and observing on next flush.
Fit
Isolate, empty, undo the two brass bolts through the cistern base. Lift cistern clear. Remove old doughnut. Fit new — orientation: wide flat face down onto pan, narrow into cistern hole.
Frequently asked questions
- Should I use silicone to seal?
- No. The doughnut is compressible — silicone gives false confidence and traps future leaks.
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