I have a 1.2 corsa c, and the black plastic pipe that screws into the top of the water pump has broken off, and my local motor factors says this part is unavailable on its own, and does not come with a pattern water pump. They are telling me I need to buy a genuine vauxhall water pump at a cost of approx £90 to sort the problem, but my water pump is ok and I only need the connector pipe. Does anyone know a cheaper solution to the problem. Paul