where is a radiator pin too?

If "pin" is the Thermostatic Valve pin it's the little yellow thing just above the collar in this picture...

http://www.diyfixit.co.uk/diy/building/remove_radiator/thermostatic_valve.jpg

You undo the collar - lift off the top and gently pull up with pliers.

If you mean the bleed screw it's here...

http://www.dover.gov.uk/privatesectorhousing/graphics/valve.jpg

Peccavi
February 2009

You need to get a Radiator Bleed key to unscrew the little pin and bleed the radiator. Pick one up from your local Plumb Center or any other Plumbing Merchant

Andy
February 2009