How to stop a copper pipe turning in the wall?

[doitall]

I've had a through-the-wall drain cock on my heating system for best part of 30 yrs and never had an issue with freezing or turning (it is ALL copper pipe) or anything else for that matter. No internal shut-off. It just works, end of.

You're saying water pipes never freezes at your castle or just that particular one.

Any reason, perhaps 100mm water proof lagging, trace heating etc

 

[kbdiy]

Never had any pipes freeze but they are all well lagged.

The drain-off just projects through the wall at below floor level. Insulated in the underfloor space but nothing through the wall

 

[doitall]

Lucky man, I can assure you they would here and several times before Christmas, I would go as far as to say they would be frozen solid for most of the winter.

 

[Norcon]

Doesn't really matter if it freezes. As long as you don't fit a ball valve.
If you want to drain down then get the kettle out or fill the system with X500.
On a new build it should be below ground level anyway and you leave the access box outside with insulation below the lid.

 

[Charnwood]

I can't believe someone would use push-fit fittings where there's going to be rotational force and not brace it properly!
Straight wallplate with pipe and a BSP draincock.