The tubing will not come into contact with anything other than the
rubber hoses used to couple it to whatever-----

Or do you mean, even touching the underbody?

Insulate it with rubber hose sections also?

I think the point that was being made was that electrolisis will start
inside the engine, and it's aluminium fittings.

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Terry--
74 Campmobile- (Clementine)
85 GL- (Delilah)
86 BMW 325 ES- (Eva)