The Motor Industries best kept secret - the part that doesn't appear on the parts diagrams, even on the dealer systems !!!
The Clutch pipe connector has TWO seals, the small O ring (which they do tell you about) and the SECRET nipple seal on the end of the pipe.
If you have a leaking clutch pipe connector, master cylinder or slave cylinder, then this video might be of some help to you
The pipe which you might be encouraged to buy from the main stealer is around £65 for Mondeo, £30 for Volvo, £50 for Skoda, but if all you need is the little seal, then some part numbers below might help save you some pennies...
PART NUMBERS
Volvo - 9181729 £9 snap on coupling (includes nipple)
Volvo - 9143918 £2 o ring
Generic - 215615 £5 nipple
FORD - ask for MK4 Transit master cylinder connector seal £2