Amazon sells cheap USB powered camera endoscope. The 3 hole pipe allows water to enter the pipe from the sides and be carried away, (french drain), while the 2 hole pipe is designed to leach water from inside the pipe away from the line, (draining the bath tub or flushing). While hanging a shelf, I recently mistakenly drilled two holes in a PVC drain pipe that was tight against the sheetrock. I used one recently and avoided drilling through a main sewage branch pipe. Fully slotted polyethylene drainage pipe is installed and covered with gravel. Sediment will eventually start to fill the French drain over time. Because PVC is a soft plastic, you can use both wood and metal drill bits to make small holes, and spade bits can be used for larger holes. To keep the drill bit from slipping, make a small divot in the pipe using a hammer and nail or center punch. This system uses a corrugated pipe surrounded by polystyrene aggregate that is then wrapped in filter fabric.. Then use the 2 1/2" hole saw centered with the pilot hole from both sides. To save some steps in the process of French drain installation, consider purchasing an alternative gravel-free drainage pipe system. Rigid PVC drainage pipe can be easily cut with a handsaw. Like another user said. This is commonly available at all building supply stores. In many cases, inadequate slope to drain the area is the original problem that usage of a french drain aims to solve. To install a French drain: The inside perimeter of the floor is cut approximately one foot from the wall. I used PVC for this project. This allows the water to leech into the soil over a given distance, rather than pooling where you don't want it. The gravel is the workhorse here I believe. The 4 inch rigid PVC drain pipe can be cleaned out with a Roto-Rooter machine - as long as you install a cleanout access point and use the proper fittings. If you choose this approach instead of manually building a French drain, skip the filter fabric and crushed stones steps listed above. Counterintuitive though it may be, French drains work by allowing water to flow into them from below. Re: What size hole to cut to fit a 2" PVC line through? Instead use 4" rigid PVC drainage pipe that has holes along the bottom edge. Once a 4-in. Use a tape on a drill and only drill up to half an inch. The finished wall is papered and it would be a mess to cut out the sheetrock to plug the 1/4″ holes. Most french drains use holed corrugated piping or holed PVC. Where possible, the lowest course of block is tapped and bled (weep holes) in order to drain the walls. DRILLING PVC. If you need to go further in, drill slowly in until you feel like the drill has gone through the back of the board. A traditional french drain is a drain that directs water away from an area via a trench filled with gravel. 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