On Friday, 30 October 2020 08:43:10 UTC, Roland Perry wrote:
I'm going to be fitting it to the central heating plumbing (as a drain
cock),

That may be vulnerable to sludge build-up especially as it should be fitted at the lowest point - you can get special Sludge Cocks.

https://www.wolseley.co.uk/product/s...ern-15-bronze/

There's a special place in hell for plumbers who install a central
heating system without a drain cock.

I've got little drain taps on each radiator between the rad and the lockshield, so each radiator can be drained individually.

Owain