Replace radiator valve but nut stuck

[Abbiel123]

Replacing bathroom towel radiator, while I‘m at it was going to change the valves for new ones, however this bottom nut is completely stuck…. Any advice for getting it off? Have tried using grips to hold still while using spanner to undo, have tried WD40, it just won’t budge

 

[exedon2]

It's only a 15mm nut it will shift with more persuasion!
As you obviously have system drained down to change valve try some heat on nut.

 

[cjg]

could be plastic pipe?????? no heat!!!!!

 

[Ben-gee]

Think of something that makes you really really angry, then try again with gusto- it’ll shift.

 

[Abbiel123]

Sorted it! Thank you! Tried using 2 spammers instead of a spanner & grip & after as much force as I could possibly give it it loosened

 

[Abbiel123]

Sorted it! Thank you! Tried using 2 spammers instead of a spanner & grip & after as much force as I could possibly give it it loosened

*Spanners