The hot water connection to one of the radiators in my house sprung a leak.

At 1am I had to go out and drain the system and turn it off so it don't flood the kitchen. No heating for me, and its been real cold here too.

Looks like the o-ring between the pipe and the valve has broken. This one had started dripping a bit a month ago and I tightened it a bit. Maybe I just went a tad too far.

God I hope the others don't start. None have dripped at all, but 3 are in carpeted areas.
Anyone think I should get them all checked? Or take the 'if it ain't broke' approach?