Slight drip from radiator...

[HarvestMoon4]

My mother has laminate flooring and she called me to say she found a small puddle of water on the floor by the radiator.

Forgot to take a photo of it but did fine a similar picture on the net, the drip is coming from the open ended bit, it points down towards the floor.

I need to know, what part I tighten up?

Thanks

P.S. Hmmmm not sure how to upload the picture here?
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Ohhhh I found the same photo of it on here, it's the first photo. http://www.diynot.com/forums/plumbing/small-leak-from-radiator-drain-cock.309661/

 

[onecog]

Tighten the small square on the end...don't overdo it.

 

[HarvestMoon4]

Thanks