Arrgghhhh...........
this is probably all my fault.
The cistern in question is a toilet cistern.
So, I take all the blame (for everything except Gordon Brown's speach today) and here is the sitch....
Geberit wall mounted loo frame, integral "cistern" has a manufacturer's supplied brass fitting which has integral stop valve and a 1/2" BSP Male (tapered) end for connection to the supply (which I plan to be mains )
Do I HAVE to use a tapered female coupling (iron end) or will parallel with PTFE be fine.
FYI the only manufacturer I have found who makes a female tapered fitting is Yorkshire/Kuterlite....and their head of sales UK says that they don't have a domestic market for it in the UK, it goes almost exclusively to Europe (under the Kimi name) and is (quote) "particularly useful for high torque compression joints as a parallel female part, with male tapered insert, can undergo stresses at the outer lip, as the male part gets steadily wider, which might cause it to split."
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