Labeling PEX Pipe

[JesseBrud]

I have installed a Hot and Cold PEX manifold in my basement and I'd like to label the individual lines.

I've read that certain adhesives can damage the PEX piping -- does anyone know what I can safely use to label my PEX pipe?

Thanks

[Cass]

A string tag.

[Lakee911]

PEX is asking for trouble as it is....


Sharpie ok?