Is your plumbing recessed too deep into the wall?
If you are unable to screw the flanges onto the thread of your new ceramic disc Modern Lever tapware then there is a good chance that it is because your plumbing is deeply recessed. Sometimes this can occur in older buildings where new adhesive has been applied on top of old rendering work, resulting in a thicker wall material being present between your tile surface and the tap seat in your walls. Our Modern Lever tapware is supplied with black PVC thread extenders which often overcome this problem. When they don’t then this ceramic disc in wall seat extender kit will bring the tap seat 28mm out.
Importantly though, when installing these ceramic disc extender kits you must first ensure that all of the old washer and red fibre body washer are completely removed from the existing tap bodies in the wall. Failure to do so will restrict the extender kit from sealing against the existing tap seat.