Generic Washer Supa Flush 3mm
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Flush sealing washers are usually soft rubber or flexible plastic that compress against the flush valve outlet to prevent leaks — ~3 mm thickness is a common thickness for these seals in Supa Flush and similar cistern systems, helping create a proper water‑tight connection between the cistern and toilet pan.
If you’ve got a specific model of flush valve or know the outer diameter (OD) of the area that needs sealing.
Also handy to know whether the flush valve is a bottom outlet or side entry, as that determines the exact washer size needed.