Geberit Type 323AG Bottom Entry Cistern Fill Valve — 136.761.00.1
The Geberit Type 323AG (136.761.00.1) is an authentic OEM bottom-entry cistern float fill valve engineered for modern exposed ceramic and plastic WC cisterns. Equipped with an integrated Type AG air gap certified to BS EN 1717 and BS 1212-4, it provides complete backflow prevention against fluid category 3 risks, ensuring mains water supplies remain protected without requiring additional anti-siphon check valves. Built with an adjustable threaded spindle for water filling height control, it delivers quiet hydraulic operation (Acoustic Class 1 compliant) under mains operating pressures up to 10 bar.
Identification Guide:
MPN: 136.761.00.1 | Geberit Model Series: Type 323AG | Connection: 1/2" BSP Plastic Threaded Nipple | Water Supply Entry: Bottom Entry (Base Connection) | Flow Pressure Range: 0.1 to 10 bar (10–1000 kPa) | Backflow Protection: Type AG Air Gap
Key Features
- Integrated Type AG Air Gap: Engineered with an air break spill-slot configuration fully compliant with UK Water Fittings Regulations and BS EN 1717.
- Acoustic Group 1 Low Noise: Hydraulic float mechanism ensures ultra-quiet cistern refilling, tested to 12 dB(A) at 3 bar and 18 dB(A) at 5 bar.
- Threaded Water Level Adjustment: Rotating the threaded vertical spindle allows micro-adjustments to the cistern water fill height.
- 1/2" Plastic Connection: Durable, corrosion-free 1/2" BSP plastic threaded nipple and locknut designed for bottom-drilled cisterns.
- Dual Pressure Operation: Operates efficiently across gravity-fed and high-pressure potable water supplies from 0.1 bar up to 10 bar.
Fitment & Compatibility
Specifically designed for exposed ceramic or plastic close-coupled and low-level cisterns with a bottom water supply connection. It is not suitable for concealed in-wall cisterns (e.g., Geberit Sigma, Omega, or Delta frames, which use side/rear entry valves such as the Type 380). Ensure your cistern base hole accommodates a 1/2" (approx. 21mm outer diameter) threaded connection shank.