On my Eddlebrock Intake I have a 3/8inch vacum port, a 3.8inch water port that is for the thermostat, and I have an unknown size port that is about an inch from the water neck. The intake is an Edlebrock Torker 2. I know it is for the heater, my question is, what size is it? I can't seem to find what size it is, its bigger than a 3/8 inch. Can anyone help me out here?