Compression Fitting On New Shower.

[elgeneral]

My old Redring Plus electric shower has finally given up the ghost.
So I have just bought a Triton Madrid II.
The fittings are a bit different as I now need to use a Str Male Adaptor 15 X 1/2" Compression fitting to connect to the plastic water inlet, the thing is I can't get it to seal, the water is coming out of the top of the compression joint, the other end is fine.......Is there a trick for fitting a brass compression fitting to a plastic pipe, upon inspection the brass olive looks a bit miss shaped.

Thanks in advance.

 

[Electric showers]

Compression Fitting

Use a new compression fitting 15mm all electric showers have the same size water connection point. Make sure its tightend up properly