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Armitage Shanks Sequential Thermostatic Cartridge Armitage Shanks Sequential Thermostatic CartridgeThermostatic Cartridge for MarkwikSequential Thermostatic Cartridge

Armitage Shanks A861123NU Sequential Thermostatic Cartridge for Markwik 21+ TMV3 Valves

Part Number: A861123NU

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Product description


Armitage Shanks A861123NU Sequential Thermostatic Cartridge for Markwik 21+ TMV3 Valves

Q&A: A861123NU Armitage Shanks Markwik 21+ Thermostatic Cartridge

Please pop us a message if you have questions regarding the Armitage Shanks (Ideal Standard) A861123NU.
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With a 98% success rate in matching spares, Di Vapor is your friendly UK spares experts!
We are here to serve your spares needs.

Q: What specific taps is the A861123NU sequential thermostatic cartridge used in?
A: Armitage Shanks A861123NU is the genuine spare part for:
– (A66696AA) Markwik 21+ Thermostatic Basin Mixer Demountable
– (A6734AA) Markwik 21+ Deck Mounted Thermostatic Tap Bioguard
– (A6791NU) Markwik 21+ Thermostatic Basin Mixer

Q: We have an A6791NU tap. How to replace the Armitage Shanks A861123NU?
A: This is how to open the Markwik 21+ Thermostatic Basin Mixer to change the A861123NU.

1. Isolate the Water Supplies
– Remove the grey button near the base of the tap. There are two: one for hot (left side) and cold (right side).
– Use a 5mm Allen key and screw in a clockwise direction to close water supplies.
– Open the tap and test if isolation is successful.

2. Remove the Tap Handle
– Unscrew, anti-clockwise, the top cover (the plate blue and red indicators sit) of the handle.
– Use a 4mm Allen key to undo the handle retaining screw.
– Lift to remove the lever handle.

3. Armitage Shanks A861123NU Cartridge Removal
– Remember the orientation of the lower temperature stop ring (see where the “maximum blend indicator is pointing). It has to be returned to the same position in reassembly. Taking a photo before lifting the stop ring out might help.
– Remove the temperature stop ring.
– Use a 36mm a/f deep socket to unscrew the A861123NU sequential thermostatic cartridge. While unscrewing the cartridge, hold on to the tap spout to prevent it from rotating.

4. A861123NU Armitage Shanks Cartridge Installation
– Insert the replacement A861123NU in the A6791NU Markwik 21+ tap.
– Screw it in place and use the deep socket to tighten. Do not overtighten.
– Return the stop ring in the same position as before disassembly.

5. Reassemble the tap handle.

6. Re-open water supplies.

The A861123NU and other Armitage Shanks Spares are dispatched on the same working day (M-F) for orders made before 3 PM.
shipping & Returns


  • Delivery of this item is priced as a 'small' packet. UK delivery costs £5.95.
  • For all in-stock spare parts the typical UK delivery timescale is 2-5 working days.
  • If you need a part urgently then we can provide a next-day (delivered Mon-Fri) UK delivery service for all in-stock small parcels ordered before 3.30pm, Monday - Friday.
  • Next day delivery is available to select at an additional charge during the checkout.
  • We delivery WORLDWIDE. For more information about international deliveries, read our delivery page.


  • If you need to return a part then please telephone Di Vapor on 0121 705 0866 with the reasons for the return within 14 days of receiving the goods.
  • For more information please see our terms and conditions.
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