The pipe from the compressor is deliberately long; it runs all the way round the back of the engine, through a hose to the offside chassis rail and back across the front cross-member. This is to allow the air to cool as much as possible before it reaches the tank. I reused the first three metres of so of steel pipe (with a coat of paint) because this can easily withstand the heat. Nylon pipe would not be suitable for this.
The steel pipe ends at a non-return valve behind the front cross-member.
I replaced the valve innards
The original steel pipe to the tank looks like this
Somewhat rusty and because I had moved the pipework to clear the new clutch master cylinder it didn't fit any more. So I replaced it with 5/8" nylon.
The ends used a 3/4" UNF thread and sealed with brass olives. I was able to reuse the tube nuts and just added new olives and an inner sleeve to support the nylon
I also refitted the safety valve and a schrader valve which I assume allows the system to be pressurised externally; that could be useful for leak testing.
Finally a nice new automatic drain valve. The old one clearly was not working because the tank was half full of water when I took it off.
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