I have bought new radiators to replace my current ones (around 25 years old). Old radiators were all fitted with TRV's.
I have put the new 15mm compression inserts into the radiator that came with the new valves/TRV's but this then makes the valves too wide to fit onto the existing pipes (by around 20mm). I think the old radiators had the inserts that have to be put in with a radiator valve key.
Do the threaded parts of the radiator that the inserts screw into come up different widths on different brands?
I have put the new 15mm compression inserts into the radiator that came with the new valves/TRV's but this then makes the valves too wide to fit onto the existing pipes (by around 20mm). I think the old radiators had the inserts that have to be put in with a radiator valve key.
Do the threaded parts of the radiator that the inserts screw into come up different widths on different brands?