On 16/02/2013 13:34, Dave West wrote:
We have a bedroom radiator that we occasionally want to turn right down. It
has 'tamper-proof' caps on the valves at each end. So I will replace one cap
with a new one that easily allows the turning of the valve.

Is it advisable to put the new cap on either the water incoming end or the
water outgoing end of the radiator?


Why not go for TRV?

I would put the adjusting valve at the most convenient end for its
intended use.