http://www.tom-parker.co.uk/product..._categories=2&level2=164&products_groups=8150
Link straight to the couplings (Thanks for the pointer Jason).
If you look at the 'Technical detail' you can download a sheet with lots of nice piccies on it!
Remember the link pipe used on an adventure is the 6mm bore whereas the others are 8mm.
I think you also need to add VAT to the prices quoted on the Tom Parker website prices.
B