In an earlier contribution to this discussion,
Lobster wrote:

Set Square wrote:

I don't know about the ceramic discs, but I suspect that the
cartridges are fairly standard.

Not so sure about that. My kitchen tap (3 years old/brand
unknown/ceramic discs) drips, and I hawked the cartridge around every
plumber's merchant in town looking for a replacement, to no avail.

Did you find any cartridges at all?

I was surprised to find that the cartridges in my Franke tap are
dimensionally the same as the works in Armitage Shanks screw-down taps. In
other words, the thread and O-ring are the same, and the length and diameter
are the same - with the cartridge having an annular seal on the end which
seals on the seat where a washer would normally be. So it seems likely that
at least some tap bodies can take either type of innards.

There *may* be other sizes of cartridge around, but it was this unexpected
commonality between two different makes and types of innards which led me to
suggest that they may all be 'standard'.
--
Cheers,
Set Square
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