Grohe 1/2" Non-Return Check Valves (Pair) — 47189000
The Grohe 47189000 is an authentic pack of two factory-original 1/2" non-return check valves (backflow preventers) fitted with integrated dirt strainer screens. Installed directly within the hot and cold inlet union connectors of Grohe exposed bar mixers and concealed thermostatic shower valves, these valves ensure unidirectional water flow into the mixer body. They prevent cross-flow between the hot and cold supplies (a common cause of lukewarm water, fluctuating temperatures, boiler cut-outs, or system backflow) and safeguard internal thermostatic cartridges against pipe scale, sand, and grit.
Identification Guide:
MPN: 47189000 (also referenced as 47 189 000) | EAN: 4005176140617 | Size: 1/2" (DN 15) | Quantity: Pack of 2 (Hot & Cold Inlets) | Includes: Spring-loaded check valve mechanism, stainless steel mesh filter screens, and pre-fitted outer O-ring seals
Key Features
- Stops Cross-Flow: Spring-loaded internal check mechanism prevents higher-pressure supplies from pushing back into the opposing pipework.
- Integrated Gauze Strainers: Fine stainless steel mesh captures dislodged rust, scale flakes, and installation debris before reaching the cartridge.
- Cures Common Valve Faults: Resolves issues with erratic temperature balancing, lukewarm shower output, boiler lockouts, and humming/hammering pipework.
- 100% Genuine OEM: Authentic Grohe manufactured components ensuring factory tolerances, reliable seat compression, and long-lasting seals.
Installation Note
Always isolate incoming hot and cold supplies before dismantling the mixer. On exposed bar showers, these valves push directly into the 1/2" inlet coupling nuts/S-union housings at the rear of the bar. Ensure the directional flow orientation is correct (mesh screen facing the incoming water feed). Lightly coat the rubber O-rings with WRAS-approved silicone grease to ensure an effortless, watertight seat, and flush the pipework briefly prior to final assembly.
Confirmed Model Compatibility
Direct OEM replacement for 1/2" inlet assemblies across Grohe exposed bar mixers, shower systems, and concealed bodies:
- Grohtherm 800 Series: 34562000 (Bar Shower), 34569000 (Bath/Shower Mixer)
- Grohtherm 1000 & Auto 1000: 34065000, 34065002, 34143000, 34146000, 34146003 (New), 34151001, 34155000, 34156000, 34313000, 34314000, 34315000, 34323000, 34323002 (Cosmopolitan M), 34334000, 34336000, 34624000, 34646000, Cosmopolitan Low Pressure models
- Grohtherm 2000 & Auto 2000: 34169000, 34169001 (New), 34170000, 34174000, 34195001, 34205000 (Special), 34216000, 34446001 (New 1/2"), 34466001 (New Bath/Shower), 34647000 (Special), 34650000
- Grohtherm 3000 & Auto 3000: 34179000, 34185000, 34188000, 34367000, 34479000, 34679000
- Grohtherm Cube: 34488000 (Thermostatic Shower 1/2"), 34508000 (Bath/Shower Mixer)
- Euphoria Shower Systems: Euphoria System 180, Euphoria System 210, Euphoria System 260, Euphoria Cube System 230
- Tempesta Shower Systems: Tempesta Cosmopolitan System 160, Tempesta Cosmopolitan System 210
- Rainshower Systems: Rainshower System 210 bar mixers & shower systems
- Allure, Chiara, Sentosa & Wave: Allure Bar Mixer 1/2", 34686 Sentosa Bar Mixer, Chiara Thermostatic Bar Mixer 1/2", Wave Cosmopolitan Bar Shower Mixer
- Concealed Built-In Bodies: Rapido T Universal Concealed Body (35500000 / 35 500 000), 34211000, 34212000, 34213000