Reich Twin Water Pump help

does the pipe not simply slide over the end of the valve? Warm the plastic pipe to make it more flexible & push it over ... secure it with a Jubliee clip. Is there anything from the old pump that could be transferred to the new pump?

To add to the above post ,ensure the jubilee clip is slid onto the pipe before attaching pope to pump

Many thanks for the replies.  The pipe will fit directly to the valve after warming but there's very little holding it in place.  As I have to drop the water tank to access the pump I need to know that there's a secure fix before I re-install. I only want to do this once!  The screw thread on the valve suggests a fitting is available specifically for this task.

The origional pump had the screwed connector. When the pump was changed and the connecting pipe I could not use the screwed connector So i installed it with a tight fitting pipe and  jubilee clip works fine.