Hi KeirM1977,
Want to join 6mm pole hose to my 8mm hosereel. What adapter do I need and who sells them. Can only seem to find 6mm to 6mm or 8 to 8

You need something like this: You are not allowed to view links.
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Also can I connect 8mm I'd hose to 6mm I'd y piece for brush jet if I put O clips on and make them tight or do I need to buy another Y piece at 8mm ?
I wouldn't have much hope of this working satisfactorily. Would it not be better to use some of your Pole Hose to connect to your existing Y piece?
Another alternative is these:
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Paul