A drain is called un tuyau in French. If that drain is the product designe to drain water away from your home's foundations, we would also use "un drain", masculine noun.

The purpose of a French drain is to move water away from your home, protecting it from water damage. You can learn more about french drains at the Wikipedia.

A rubble drain is also called a French drain, blind drain, rock drain, drain tile, perimeter drain, land drain or French ditch. They are constructed by digging a step-sided trench, filling the trench with loose stones, and covering the stones with earth.

probably in France

Shops which are mostly for home solutions can be an answer for your problem. In those shops you can find professional employees and ask them for the best quality French drain.