Ideal Standard Cold Non-Return Check Valve Assembly — A963433NU
The Ideal Standard A963433NU is an authentic factory replacement non-return (check) valve cartridge assembly engineered specifically for the cold water supply inlet across selected Ideal Standard and Trevi thermostatic shower valves. Designed to maintain directional flow and prevent back-siphonage into the cold water mains or feed pipes, this genuine internal check valve prevents cross-contamination between unequal hot and cold supplies, restores stable temperature regulation, and prevents system backflow when replacing a calcified, stuck, or passing original valve.
Identification Guide:
MPN: A963433NU | Legacy Barcode / EAN: 5055639184428 | Brand: Ideal Standard / Trevi | Supply Side: Cold Water Inlet | Function: One-Way Non-Return Check Valve
Key Features
- Original Manufacturer Spec: Precision-moulded and calibrated to Ideal Standard factory tolerances for reliable, leak-free directional sealing.
- Prevents Back-Siphonage & Cross-Flow: Stops hot water crossing into the cold water pipework under unequal system pressures.
- Restores Temperature Blending: Resolves fluctuating showering temperatures, lukewarm delivery, or pressure drops caused by a failing check valve.
- Supplied Complete: Factory cartridge core pre-assembled with internal spring, check plunger, and elastomeric sealing O-rings for direct installation.
Verified Compatible Models
Engineered specifically for the cold inlet port of the following Ideal Standard, Trevi, and Serenis models:
- A3250AA / A3250AZ / A3250NP: Trevi Central Therm built-in thermostatic shower valve (Chrome, Light Gold, Mixage)
- A3970NU: Trevi TT Central built-in thermostatic shower valve rough-in body
- A4290AA: Melange trim set for use with Trevi TT A3969NU shower valve
- A4627AA: Ceratherm 200 exposed thermostatic bar valve
- A5346AA: Glance trim set for use with A3141NU / A3143NU shower valves
- A7200AA: Trevi Electronic EBC II built-in bath & shower mixer valve
- L8360AA / L8362AA: Serenis 360 peninsular & corner shower enclosures
- L8364AA / L8365AA: Serenis 180 corner & alcove 1700mm shower enclosures
- L8370AA / L8371AA: Serenis 180 corner & alcove 1400mm shower enclosures