My gas water heater is certainly leaking gas. I can smell it.
Using the image below, it seems like it might be coming from the red circle where the dial connects to the thermostat or the blue circle where the manifold tube connects to the thermostat. I don't smell anything around the green circle, the pilot tube.
Is it even possible to leak where the red circle is? If not then I assume it is the blue circle, the manifold tube. Is there a trick to tightening the manifold tube, like there is for water pipes? I have it as tight as I can get it right now. If it is leaking from the red circle area do I have to replace the whole thermostat?