The flat part in the tap that spreads the spring pressure evenly
Several small parts work together in the steam and water tap: a spindle, a spring, a ball or ball plate, plus flat plates and discs that transfer the spring pressure evenly onto the sealing surface. If one of these parts fails, you feel it straight away at the handle.
Rocket lists this plate under A829904376 for the Evoluzione and the Premium Plus. Both are version designations rather than models for which our category system has a tag – we still mention them in the title so they can be found.
When it is due
A tap that no longer closes cleanly and keeps dripping even though the seal is new often has a problem in this chain of parts. Deformed or worn plates spread the spring pressure unevenly.
A second sign is a handle that turns unevenly: first light, then stiff, or with a noticeable jolt at a particular point.
Once removed, a used plate usually shows a shiny surface worn on one side or a slight curvature it should not have.
At a glance
| Type |
Plate, pressure piece |
| Location |
Steam and water tap |
| Fits |
Rocket Evoluzione and Premium Plus |
| Scope of delivery |
one plate, without spindle, spring and sealing ring |
| Part number |
A829904376 |
| Finish |
Metal |
| Installation |
Installation by a professional recommended |
| Brand |
Rocket |
Important for installation
The tap carries steam and hot water. Before opening it, disconnect the machine from the power supply, release any residual pressure and let it cool down. The order of the parts in the tap is crucial – if you do not keep track of it when dismantling, reassembly becomes guesswork. We deliberately do not give step-by-step instructions here.
Who it is for
For workshops overhauling a steam or water tap on an Evoluzione or Premium Plus.
For experienced DIY repairers who have already had the tap open and want to replace a single part. On these series, the plate also goes together with the washer for the rotary knob, A829904375.
What goes with it
The same tap also holds the ball plate, the spring and the O-ring.
The matching spindle for these series is the spindle Premium Plus and Evoluzione, together with the washer for the rotary knob.
You will find more items in Rocket accessories and spare parts and in the original spare parts.
Our workshop routine: we lay out the parts of an opened tap side by side on a white cloth, in exactly the order in which they come out, and photograph the row. It takes twenty seconds and saves any puzzling over which disc goes where when reassembling. This is our habit from Bern and Zurich, not a manufacturer requirement. For the function test, we froth milk and pull a cappuccino with Cozy Chocolate.
No returns
Original spare parts are excluded from exchange and return. They are sourced specifically for each order and cannot be resold after installation or a test fitting on the machine. So please check the model, year of manufacture and serial number of your machine before ordering – or drop us a line and we will clarify the fit together. Your rights in the event of defective goods remain unaffected.
Frequently asked questions
Is this the same plate as the ball plate?
No. The ball plate is a separate item with its own number. The manufacturer lists this plate under A829904376.
What are its dimensions and material?
Neither dimensions nor material are documented for this item. The part number is what counts.
What do Evoluzione and Premium Plus mean?
These are version designations from Rocket. Our category system has no separate model categories for them, which is why they are mentioned in the title and in the table.
Is the plate enough if my tap drips?
Sometimes. More often it is due to the sealing ring, valve seat or spring. If you open the tap, you should check the whole chain.
Can I look at the part in your showroom?
Yes. We are in Bern at Gerberngasse 44 and in Zurich at Hagenholzstrasse 50b. Bring the removed part with you, we will compare it with the replacement on site and you only take home what really fits.
Questions about the fit or the serial number of your machine? Write to us at [email protected]. We deliver across Switzerland and to Liechtenstein in 2-4 working days.
