The larger plastic tubing is about the same size as a garden hose but harder plastic. Smaller tubing is about 1/4 inch. You can use emitters or drip lines that have a small hole every few inches. You add taps into the larger harder plastic supply lines with a tap tool which punctures a specific sized hole for a tap. The taps are just small pieces of plastic with a hole through them and they have nipples at both ends to lock them into the larger tubing and hold the smaller drip line tubing. The taps are hard to pull back out and will make the hole a little larger. I found a few taps without holes through them which I guessed were to plug any mistakes. Make sure you lay out the larger tube to supply water at line pressure to as much of the area you want irrigated as possible. If you use drip lines, you need to keep them fairly short and roughly the same length so that they drip evenly. Each hole in the drip line reduces the water pressure and you will barely have any water flow the end of a long length. I added a very long piece of drip line to a single tap for my first time and the first few feet were ok, but the rest was significantly less. The emitters are very small holes and I expect them to clog easily so I use a filter and I use a programmable timer to turn the water on and off.