We've just had to replace 15mm pipes with 22mm to install a new mixer shower, which meant cutting the 15, pipes at the T and running 22mm from there up to the shower valve. For the most part I've used solder ring joints, which are sound, but I though for 'ease of use' I'd use a pushfit reducer where the 22mm meets the 15mm, so I could assemble everything else then 'simply' push the finished pipes onto the old ones.
However, when I pushed the pipes on (one of them in particular), they only connected for approx 5-10mm before sticking. One I manged to push further, but the other is stuck fast. I can neither pull it off nor push it further, and it seems very loose as it can wobble from side to side on the joint. Before you ask, yes I cleaned the 15mm pipe and it was cut square.
I've turned on the water supply and bled the trapped air from the top of the pipes, and there are no leaks so far, but obviously I'm slightly concerned about the possibility of leaks in the future. The joints are below the bath line, so easy to get at should I need to.
The only thing I was thinking is perhaps adding solder around the loose joint, or some other kind of seal.
Any ideas? Other than cutting it off and starting again (there's not much 15mm pipe left above the T).