Thanks for the tip... My mate said he searched for a long time to find a t-piece that fits, because it must have two different diameters... (one hose has a smaller diameter)

But I will tell him to search for it on the Demon Tweeks catalogue...

You said you bought yours from GGR - I donīt understand why they do not have it in their list of Focus RS parts on their website???
Seems like they donīt want to sell it