Harry Bloomfield wrote:

Andy Burns has brought this to us :
IME yes, the conical profile seems to be quite standardised across
manufacturers ...

..Bur only until you buy a replacement head or hose, then all
replacements seem to be parallel unless OEM.

The one supplied with our shower had two sizes of taper, and they
suggested matching it to the shower head. At the other end it is held
only by the threaded outlet and washer, the outer taper is not engaged.
The existence of two sizes is a slight concern.


--

Roger Hayter