Unvented cylinder D2 pipework installation to toilet waste pipe

[MPGASANDPLUMBING]

Hi guys, just want to get advice, i want to replace venten to unvented cylinder, is it ok to install D2 pipe to toilet waste pipe see picture? as there is no easy options to get it outside.

 

[ShaunCorbs]

Yes fine aslong as it is waste and not an extractor fan vent

 

[Last Plumber]

Hi guys, just want to get advice, i want to replace venten to unvented cylinder, is it ok to install D2 pipe to toilet waste pipe see picture? as there is no easy options to get it outside.View attachment 87553

This link will take you to the document required. See page 22 & 23. They explain D1 & D2 materials and termination points.