The main water valve on the city side of the water meter was dripping around the valve stem -- i attempted to tighten the packing nut a bit and it seemed to stop, but noticed it again next time i passed the meter. Upon closer inspection, noticed that there was a crack in the packing nut on the bottom side where i couldnt see it. Called the water utility, thinking maybe cuz the valve was on their side of the meter, that it may be their responsibility, but was told anything but the pipe itself and the meter is my responsibility. Question is, is it possible to buy a packing nut to replace it, and can the old one be removed and the new installed while the valve is under pressure? Or any other suggestions, other than calling a plumber? Im not in a big hurry, as its not leaking much, and its not costing me anything cuz the drip isnt being metered, but it should get fixed to avoid any extra basement moisture. Thanks.