Tavistock Apex Side Entry Fill Valve Replacement — APX790 Cistern
This is the dedicated replacement side-entry inlet fill valve specifically configured for the Tavistock Apex APX790 toilet cistern. The original factory-fitted grey plastic inlet valve is obsolete and no longer manufactured. When purchasing this item, you will receive the updated, fully compatible replacement valve designed to mount through the existing side-entry aperture of your Apex cistern, restoring fast, quiet refilling and reliable shut-off without modifying your pipework.
Identification & Technical Guide:
Compatible Brand: Tavistock | Target Cistern Range: Apex | Cistern Model Code: APX790 | Internal Reference: FTB14399 | Entry Type: Side Entry (Horizontal Inlet) | Inlet Thread Size: 1/2" BSP (approx. 20.9mm OD — standard UK plumbing size) | Original Part Status: Obsolete Grey Model Replaced
Key Features
- Direct APX790 Fit: Specifically dimensioned to fit inside the compact internal footprint of the Tavistock Apex cistern without catching on the flush mechanism.
- Replaces Obsolete Grey Inlet: Fully supersedes the fragile, discontinued original grey factory assembly with an updated, durable valve mechanism.
- Standard 1/2" BSP Connection: Fits UK standard 1/2" tap connectors and flexible isolating valves without needing step-down adaptors.
- Adjustable Water Level: Easily calibrated float mechanism ensures the water level aligns precisely with the cistern's designated waterline.
- Quiet Hydraulic Operation: Engineered for minimal acoustic disturbance during the refilling cycle while preventing hydraulic water hammer.
Installation & Compatibility Notes
Visual Notice: The original factory-installed grey unit is no longer available. You will receive the updated replacement unit as illustrated in our product images.
Fitting Advisory: Ensure the cistern water supply is fully isolated before removing the existing side valve. Hand-tighten the retaining nut against the ceramic side wall and secure with a further half-turn using an open-ended spanner. Do not overtighten.