Originally Posted by mad_machine
the downside is it is now a lot harder to run new wires or replace old ones.. it can also hide corrosion from view.
What you can do is leave a couple pull strings in the conduit with small steel washers tied to the end. You can either tuck the string in the ends of the conduit Then retrive as needed with a small telescoping magnet or cut a small slit in each end of conduit to secure string until needed.
And avoid using wire with connnectors ( if possible ) inside the conduit, if you can, make a new run