Does anyone know what size the pipe behind the seats are on a fh4?
I am not at work until Tuesday so cant measure it. Air dusters seem to come with either a 6mm or 8 mm t piece,
Thanks
Think it’s 6mm. If your buying the fitting (T) from a truckstop will be correct size…
Waits to be corrected. 
That set has everything you need 
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6mm it is then,
thanks