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The combi boiler water filling tap (filling valve) is used to top up the water lost from the heating circuit and bring the pressure back to the operating value. In Baxi's official spare parts lists, this part appears as item 90 – FILLING TAP; its code is JJJ005667980 (short form of the same code: 5667980).
In the field it is also known as the water top-up valve or water filling valve.
Thread size is G1/4 inch, male thread on one side, female port with a free-turning nut on the other. Elbow (90°) body, with a black knurled plastic knob.
In Turkey both appliances are simply called Baymak Main, but their filling taps are different parts. The distinction is clear in Baxi's own catalogs:
| Appliance | Westen equivalent | Filling tap code |
|---|---|---|
| Main · Main Digit | Quasar · Quasar Plus | JJJ005667980 / 5667980 ← this product |
| Main Four | Quasar D | 5700370 / 710224400 — not this product |
On the Main Four / Quasar D, the part is not a stand-alone tap but a multi-port brass connection body that combines the heating outlet and filling — it does not look like this product either. Check your appliance's model label.
Baxi changed this part during production: Main appliances before serial number B323 use the tap with code 5663780, and the manufacturer does not consider these two parts interchangeable. If your appliance is from the older series, compare the removed part with this product.
A leaking or not fully closed filling tap continuously lets water into the system. The pressure rises slowly; when it approaches 3 bar, the safety relief valve opens and the boiler starts dripping water from underneath. Most users think this is a safety valve fault, but the cause is often a filling tap left open.
If the pressure is rising, the sequence is: first verify that the filling tap is fully closed; if it is closed and the pressure still rises, check the expansion vessel (ruptured membrane) and then the plate heat exchanger (mains water mixing into the heating circuit).
| Brand | Model | Code |
|---|---|---|
| Baxi | Main 18 Fi · Main 24 i · Main 24 Fi · Main Digit 240 i · Main Digit 240 Fi | JJJ005667980 · 5667980 |
| Westen | Quasar 24 · 24 F · 24 i · 24 Fi · Quasar Plus 24 i · 24 Fi · Aequator M 24/24 · M 24/24 F · MI 24/24 F | 5667980 |
| Baymak | Versions of the Quasar 24 i and 24 F sold in Turkey under the Baymak badge | — |
| Roca | Victoria 24/24 · 24/24 F · 24/24 T (GN/GP) · Neobit S 24-24 · 24-24 F | 125566798 · 9158951 |
| Chappée | Initia Master 2.18 FF · 2.24 CF · 2.24 FF | — |
| Cointra | Supra Compact | 9158951 |
🪤 Note for Alarko Trendy: the market states that this tap is also used in Alarko Trendy appliances, but there is a separate code in Alarko's own spare parts list. Before ordering for your Alarko appliance, compare the thread size (1/4 inch) and the nut port shape of the removed tap with this product.
| Baxi code | JJJ005667980 (short form 5667980) |
| Roca code | 125566798 · 9158951 |
| Official description | Filling tap — item 90, hydraulic inlet group |
| Thread size | G1/4 inch · male – female |
| Body shape | Elbow (90°), with free-turning nut |
| Body material | Nickel-plated metal |
| Knob | Black knurled plastic, fixed with a screw |
| Operating pressure | Combi boiler heating circuit — fill to 1.3 – 1.5 bar |
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