Pex pipe oxygen barrier

[Johnyc86]

Fast one for the experts

Does the oxygen barrier prevent o2 from entering the pipe on lets say a negative flow or o2 out on a positive flow.or neither??

 

[ShaunCorbs]

The fittings don’t have an oxygen barrier

 

[Johnyc86]

But the pipe itself??
Called barrier pipe.polyethylene

 

[Last Plumber]

I don't use the stuff but from memory it was to prevent air entering the pipe through the walls. As I say, I never use it so it is only what I heard at the time they introduced it. Before that there was no barrier.

I know plastic is useful at certain times but there are too many if's and but's with it for me.

Why do you ask?