When measuring for heater hose, you measure the outside of the pipe the hose goes on, right?
Then its 1/2" hose as the rear heater hose pipe is 1/2" outside diameter.
Replacing the rusty rear heater pipe is very $$$ and looks like a PITA.
One could just run rubber hose inplace of the pipe BUT you would have problems with the hose rubbing and causing a leak.
Is there SS braded 1/2" heater hose?
Is there a bullet proof (condom) cover you can cover the hose with?
As for just addind a shut off valve, it would be hard to get one on where the rear heater hose starts at the heater valve. Its very tight there and the hose is very short. You would need a sharp angle molded hose to go on the pipe.
Then its 1/2" hose as the rear heater hose pipe is 1/2" outside diameter.
Replacing the rusty rear heater pipe is very $$$ and looks like a PITA.
One could just run rubber hose inplace of the pipe BUT you would have problems with the hose rubbing and causing a leak.
Is there SS braded 1/2" heater hose?
Is there a bullet proof (condom) cover you can cover the hose with?
As for just addind a shut off valve, it would be hard to get one on where the rear heater hose starts at the heater valve. Its very tight there and the hose is very short. You would need a sharp angle molded hose to go on the pipe.