Ideal Standard Trevi Boost Shower Cartridge — A963855NU
The Ideal Standard A963855NU is the genuine replacement shower mixer cartridge engineered specifically for the Trevi Boost shower valve collection. The Trevi Boost system uses a patented venturi mechanism, utilising incoming mains-fed cold water pressure to draw and boost low-pressure gravity hot water without requiring an electrical shower pump. Replacing a worn or calcified cartridge restores accurate water blending, smooth lever control, and solves persistent problems such as dripping shower outlets, reduced flow rate, and temperature fluctuations.
Identification Guide:
MPN: A963855NU | Legacy Barcode / EAN: 5055639188990 | Brand: Ideal Standard / Trevi | Cartridge Type: Single Sequential Venturi Boost Cartridge | Material: Engineering Polymer with Factory O-Ring Seals
Key Features
- Genuine OEM Component: Exact factory replacement manufactured by Ideal Standard to ensure exact chamber alignment and seal integrity.
- Patented Venturi Boosting: Regulates the cold-water drive jet to draw gravity hot water efficiently, maximising flow performance.
- Cures Common Valve Faults: Stops leaks from the shower head, eliminates stiff temperature adjustment, and stops cold/hot water cross-flow.
- Supplied Complete: Pre-assembled cartridge body supplied with pre-fitted silicone O-rings for a fast, watertight installation.
Verified Model Compatibility
Compatible with all genuine Ideal Standard Trevi Boost shower valves, including:
- Trevi Boost Built-in (Concealed): E960583AA, E9005AA, and linked concealed bodies.
- Trevi Boost Exposed (Surface Mounted): A5636AA and associated wall-mounted bar bodies.
- Cross References: Replaces part numbers A963855NU, A963855, and internal casting code E960583.