I'm shortly going to replace all my radiator valves with TRVs and drain-off
lockshields and reckon that it's probably a good idea to clean up the
threads in the rads to get rid of accummulated gunge (dried up Boss White
etc.) before screwing in the new tails.
Any idea where I can get a 1/2" BSP tap (plug rather than taper) for the
purpose? It doesn't need to be exotic, and won't be cutting new threads -
just cleaning up old ones. The sheds and local PMs don't seem to sell them -
nor do Screwfix or the likes of BES as far as I can see.
Cut a couple of longitudinal slots down one of the old ones - that should
act as a tap to clear out any gunge. Perhaps better still get an iron
fitting and do it to that. Although brass should be ok.
BTW, the drain off lockshields work only for the pipe side if you close
the lockshield. IIRC.
*I couldn't repair your brakes, so I made your horn louder *
Dave Plowman email@example.com London SW
Possible, I suppose - and this *is* a DIY NG! <g> But I think I'd rather
have the real thing.
No - the other way round. The drain *always communicates with the rad
regardless of whether the valve is open or closed. So close the valve to
drain the rad while keeping the water in the pipe, and open it to drain the
pipe as well.
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