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Central heating Radiator valves?

CAn any body tell me what is causing a green residue
to form on my central heating radiator valves (Taps).
How best can I get rid of it.
Mel Lobo, September 2008
It's oxidization and quite normal,copper is a great conductor of both hot and cold,but as it's central heating I would look for a leak around the spindle gland,have you tried tightening the gland nut,you may have a tiny leak.

Rich, September 2008