Conor Posted April 28, 2021 Share Posted April 28, 2021 I know red-brown is for underground and black is above. Within the envelope of the house it would mean black... and when I go below the floor slab or through an external wall I switch to underground pipe. My main question, is there any difference between grey and black pipes??!!! https://www.screwfix.com/p/floplast-sp3-single-socket-soil-pipe-black-110mm-x-3m-2-pack/56187 https://www.screwfix.com/p/floplast-sp3-single-socket-soil-pipe-grey-110mm-x-3m-2-pack/15484 Link to comment Share on other sites More sharing options...
PeterW Posted April 28, 2021 Share Posted April 28, 2021 11 minutes ago, Conor said: My main question, is there any difference between grey and black pipes??!!! Nope. Both are PVC with UV stabilisers. Just watch out for the light grey ABS solvent weld that is a slightly different diameter. Link to comment Share on other sites More sharing options...
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