Using underground fittings internally

[john]

Is it ok to be using brown underground soil pipe internally. I`ve read that grey is required outdoors because it is UV stablised & brown isn`t. I can`t see that a brown soil pipe boxed in internally will get a lot of UV exposure so presumably is ok? Don`t want my local BCO complaining when they see it if I`m wrong !!

John

[David W.E. Roberts]

Ask your BCO. Most of them are vaguely human.

Also, why? AFAIK grey is about the same cost as brown.