My house has 3 outside taps. Each of these taps has a green hexagonal thing on it that dribbles water every time I use the tap (not too much of a nuisance when I am filling a bucket but irritating when I want to use the hose). I can turn these hexagonal things by hand and they look like a large nut but they don't unscrew when turned these just go on twissling. I was told by a friend last weekend that these things are some kind of frost protection device.
Is there anything I can do with these things to stop them dribbling short of replacing the whole tap. I don't want to continue to dampen the ground around the taps every time I try to use the hose.
Just to be clear - The tap itself doesn't drip when it's turned off, it's these hexagonal attachments that drip when the tap is on.
Thanks in advance for any help.
Regards Mark