15mm pipe? Try one of these https://www.screwfix.com/p/talon-15mm-snappit-10-pack/98443 with rigid plaster/filler around it. If the heat expansion is making the pipe bow up and down you could try to loosen fittings further back to allow for lateral movement.
15mm pipe? Try one of these https://www.screwfix.com/p/talon-15mm-snappit-10-pack/98443 with rigid plaster/filler around it. If the heat expansion is making the pipe bow up and down you could try to loosen fittings further back to allow for lateral movement.