:confused: Can you help m please!! I have fitted new internal workings in a toilet system and in order to remove the cistern from the wall I had to disconect the water supply. This was controlled by a compression joint. All I did was turn off the water supply ( always a good start ) and then loosen the joint before pulling it apart. Now have don that I find that when I have reassembled everything no matter what I do on re fitting the compression joint the collar refuses tighten back up? There is no damage to either of the threads on the collar or on the spiggot, no matter how hard I push the joing back into its fitting the collar won't retighten. Anyone out there had this problem before? My DIY skills are best described as basic indeed :confused:

Which end of the toilet supply,(see image) is giving you a problem? Tom,

I'm going to guess that you have a hard chrome supply tube. Not a flexible supply tube like Tom is showing. That tube must be put in the stop valve perfectly straight (it can be bent or shaped to to that) in order for the nut to start.

Do yourself a favor and get a flexible supply like Tom is showing. Whenever I come across the hard supply tubes I replace them with flexible ones as a matter of practice. Just so much easier to work with and seal so much better.

Once the compression collar (ferrell sleeve) or the cone-shape end of metal water supply tubing is compressed then there is a 50/50 chance it can be reused. Do as Tom suggests: but flex connector. It is easy to install and costs $5.00.