Hello Experts,

I am working on a walkway and would like to extend my downspout under the walkway.

For this, what type of pipe should I use- 4" sch 40 or the Triple layer drain pipe.

4" sch 40 pipe does not fit to the pop up drainer.

The triple layer drain pipe - will it collapse when compacting the subsoil before using gravel and sand.

Any help will be greatly appreciated.