Siamp Deluxe Optima 50 and 99T BP WC Flush and Fill Component Pack
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The Siamp Optima 50/99T BP component pack combines the matched filling and flushing parts listed below for a coordinated WC cistern repair. It is supplied as one manufacturer pack under Siamp part number 37998110. Replacing both mechanisms together is useful where the cistern needs a broader internal service. Check both valve arrangements against the cistern before ordering.
| Brand | Siamp |
| Model | Optima 50/99T BP |
| Manufacturer part no. | 37998110 |
| Pack quantity | 1 |
Set the inlet’s telescopic height so it sits below the lid before fitting. Hand-tighten both the flush valve nut and the inlet backnut to the ceramic and add no more than a quarter turn — over-tightening damages either mechanism and is not covered by Siamp’s warranty. Use no sealing paste or compound. Tap connector not supplied; Siamp requires an approved check valve at the supply connection. Set the water level 20 mm below the overflow, mount the button with its nut and clip the cable case before replacing the lid. Use no limescale or chlorine cleaners in the cistern.
Specification sheets: Optima 50 flush valve (PDF) · Compact 99T BP filling valve (PDF) · Installation manual (PDF) · See related WC cistern parts.
