The stuff Virgin used had a plug on one end and was very thin, so blew though easily, but of course we're talking about OR here.

You can get a whole range of size in nylon pipe, but of course the bigger the pipe the harder to install.

https://www.advancedfluidsolutions.co.uk/16mm-od-x-1...

I've also used flexible conduit like this, again you can get many sizes. The only downside to this stuff is the ridges make it harder to pull things through, but the upside is tighter bends, which can be more difficult to get the cable round though.

Whichever style pipe is used you can use a vacuum cleaner to suck string through,, if it's a bigger pipe tie some cotton wool or kitchen towel to the string and it will suck through easier.

Edited by R0NSKI (Sun 08-Dec-19 08:44:03)