The SMR coding does not identify the size.

Tap Magician compatible replacement for the SMR stamped valve which has 20 teeth, measures 52mm tall and has no threaded collar.

If this specification does not match your own cartridge Click here to view the other SMR coded cartridges

Known by San Marco code 3819R or SP3819 or 133.0358.056,133.0358.057.

06/08, 10/08, 06/10, 03/10, 08/10, 10/10, 11/10, 01/11, 06/11, 07/11, 09/11, 12/11, 01/12, 04/12, 06/12, 07/12, 09/12, 12/12, 01/13, 03/13, 05/13, 06/13, 07/13, 09/13, 11/13, 10/13, 06/14, 07/14, 11/14, 06/15, 01/16,
San Marco 2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 MS WRAS.

If your tap is dripping or leaking out the spout its time to change/ replace the internal ceramic disc cartridges (known by tap valve, tap insert, tap gland)
Cartridge is quarter turn BSP 1/2".

This cartridge may come out attached to an adaptor bush. The bush is a separate part.
There are two types of bush used on this cartridge so you will need to measure the thread on the bush.
This may be 28mm which is our SB28 (3409R SP3409 133.0069.390) or 34mm thread which is our SB34 (SP3408 3408R 133.0069.391).
You can try and separate your cartridge from the bush.
If you are struggling to remove your old bush it may be corroded on and you will need to purchase a new bush.

How can I remove my handle? is it easy to replace my cartridge myself?
Watch our how to video for guidance on removing tap handles and replacing tap cartridges and removing an adaptor bush.