Waste water pipe split g

Hi does anyone know the sizes of the pipe work and what grade do we have to use

Presume you're talking about the convoluted drainage pipe on the outside under your van. This is 26mm and what AS provide although their spares catalogue lists it as 28mm.

on my warwick duo the convoluted drain pipe for fresh water,grey water pipe is I.D.32mm
just ordered some after buying i.d 34 mm and it leaked.
terry

AS only list one type of pipe in blue or grey as shown here. I have some of that pipe and the photo below shows the internal diameter. This is what is fitted to my Duo and I've recommended it to dozens of members over the years.[You must be registered and logged in to see this link.]

Paul thankyou had a senior moment   you are right
Terry