[Heater63]

You can use smaller than 3/8, I just like a little over engineering and working the larger dia stuff.
Get a piece of that thermal sleeving Summit sells to shield lines that are too close to exhaust. ThermoTec IIRC looks like a foil tube, u can slide it on, or to go on an existing line, just cut it lengthwise and slip it over the line. Mr Gasket makes a braided version.
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