The Current 3547R Valve is stamped 2014 onwards. There is an earlier SMR 3547R valve that is different from the current 3547R Valve. Unfortunately the Discontinued Old Valve looks like the New Valve But the key difference is that the current valve has a flatter seal. If you have the earlier Valve (stamped 2013 or earlier – the valve is stamped month / year  as on a Bank Card e.g  06/13, 07/12) then you should purchase this valve 4276R.  You will receive a two threaded version called 3561R which the manufacturer of your Tap recommends that you use if you have the earlier ‘discontinued’ one threaded valve (dated 2013 or earlier).  However, if you have an Installation Guide that states 3547R (or SP3547) then you can buy the SP3547R valve .  Your Valve will have a 2014 or later stamp on it and then you can buy the actual current 3547R.