The Siamp Compact 99T BP is a bottom entry WC filling valve with a 1/2 in plastic connection. It controls cistern refill using a quiet hydraulic closure and is intended for replacement or original-equipment installation in compatible ceramic or plastic cisterns. Check the inlet position, connection and internal clearance before ordering.
Compact 99T BPLow pressureTelescopic heightHydraulic closure
| Brand |
Siamp |
| Model |
Compact 99T BP |
| Entry position |
Bottom entry |
| Connection size |
1/2 in plastic |
| Operating pressure |
0.1 to 10 bar |
| Flow rate |
0.22 l/s at 3 bar |
| Dimensions (H × W × D) |
235 to 344 mm high |
| WRAS approved |
Yes |
| Manufacturer part no. |
30998010 |
| Pack quantity |
1 |
InstallationSet the telescopic height first so the valve top sits below the cistern lid, then fit with the inlet rubber washer inside the cistern. Hand-tighten the backnut to the ceramic and add no more than a quarter turn — over-tightening damages the valve and is not covered by Siamp’s warranty. Use no sealing paste or compound on the plastic thread, and no limescale or chlorine cleaners in the cistern. Tap connector not supplied; Siamp requires an approved check valve at the supply connection. Set the water level 20 mm below the overflow with the grey adjusting screw.
Specification sheet (PDF) · Installation manual (PDF) · See related WC cistern parts.
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🆓 Free Local Delivery (Orders £100 & above)
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