Shower Fitting Problem

[twinaxel]

Hi,
Just started fitting a replacement shower and my query is about the S fittings, the 15mm feed pipe is to big for the fitting. I have measured the internal diameter of the fitting
and it is nearly 1mm smaller than the pipe OD.

Doe's anyone know where I can get replacements please.

 

[Bahco]

What S fittings

 

[muggles]

No idea what you're on about - pictures would be useful