Don't do it up till you have the pipe in thats what grips it and seals any water from leaking.
When you fit it on the pipe the olive must grip the pipe where you have your insert in the end of the plastic pipe the insert is there to strengthen the pipe.
The insert is about 20mm long grip it half way along it.
Watch this link it'll giive you an idea.
Bar mixer
When you fit it on the pipe the olive must grip the pipe where you have your insert in the end of the plastic pipe the insert is there to strengthen the pipe.
The insert is about 20mm long grip it half way along it.
Watch this link it'll giive you an idea.
Bar mixer