In message , at
02:06:59 on Fri, 30 Oct 2020, remarked:
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.

Good for you. If only any other plumbers did the same.
--
Roland Perry